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Tidy up Type/TcType stuff in DsCCall/DsForeign

Set -DDLLized when DLLized is true for use in C source

Add stubs for ILXized cbits DLL.

Don't call resetNonBlockingFd when DLLized; this stops the cbits DLL
depending on the RTS, which ILX needs; it doesn't matter for Windows, as
that doesn't have non-blocking IO implemented anyway.

Fix DLL building, and add support for linking .hsc.o files into cbits libraries

s/extra-bin/bin/ because this is where all programs are installed to.
Perhaps it should be changed the other way around - I don't know what
this extra-bin was supposed to be.

Fix paths in installed hsc2hs driver.

hscStmt: track changes made to the TC entry points typecheckExpr, typecheckStmt

eqForeignPtr: implement equality using new primitive

Heal HEID

- eqForeignObjZh in include/PrimOps.h didn't have quite the right
  shape (the result is a macro arg). hslibs/lang/ForeignObj
  wasn't up on the change to eqForeignObj now being a primop.

- recent ghc/compiler/deSugar/ changes broke the handling of
  CCall & FFI decls quite a bit. Backed out most the rewrites
  of Type.splitFoo to TcType.tcSplitFoo (i.e., now back to using
  TcType.tcSplitFoo).

  The backed-out newtype-related changes were by no means accidental.
  But, I don't profess to understand their intention to make the
  proper fix, so my change is just a stop-gap measure to get HEAD
  back to the land of the living.

- recent changes to the behaviour of 'hiding' & qualified names
  broke hslibs/lang/CString hslibs/data/edison/Seq/ListSeq,
  hslibs/data/edison/Coll/TestOrdBag, hslibs/data/edison/Coll/UnbalancedSet,
  hslibs/data/edison/Coll/TestOrdSet, hslibs/data/edison/Seq/TestSeq

- rename 64-bit 'primop' funs that now live in lib/std/cbits/longlong.c
  back to what they used to be called (i.e., prefixed with "stg_").
  Why?
     - less likely they'll clash with other (user supplied) entry points
       at link-time.
     - matches protos in ghc/includes/PrimOp.h

add warning about not changing WhatGccIsCalled from build.mk.

remove superfluous "return ()"

error msg wibble

check TMPDIR (got lost somewhere in the conversion to SysTools)

Don't build RTS for ILX

Improve comment

Function stubs for ILX

Add StgPrimFloat.c for ILX

------------------------------------
	Tidy up the "syntax rebinding" story
	------------------------------------

I found a bug in the code that dealt with re-binding implicit
numerical syntax:
	literals 	(fromInteger/fromRational)
	negation	(negate)
	n+k patterns	(minus)

This is triggered by the -fno-implicit-prelude flag, and it
used to be handled via the PrelNames.SyntaxMap.

But I found a nicer way to do it that involves much less code,
and doesn't have the bug.  The explanation is with
	RnEnv.lookupSyntaxName

Need to add -Icbits even for ILX

Don't use relative #include paths, as these files will be compiled from
inside cbits (they're now linked into the cbits library). All paths on which
include files may be found must now be given with -I directives.

Make eqForeignObj a primop; N.B. Not implemented for the NCG

Explain why errno is imported via a function

Move 64-bit arithmetic support into std_cbits; there's no reason for it to
be in the RTS.

ppFilesFromSummaries: to cope with recent driver changes,
only report a file as being preprocessed if it differs from
the source file(name).

Fixes awfully bad breakage when using --make (source files
were being deleted).

Remove DsHsSyn; really part of my previous commit

--------------------------------------------
	Fix another bug in the squash-newtypes story.
	--------------------------------------------

[This one was spotted by Marcin, and is now enshrined in test tc130.]

The desugarer straddles the boundary between the type checker and
Core, so it sometimes needs to look through newtypes/implicit parameters
and sometimes not.  This is really a bit painful, but I can't think of
a better way to do it.

The only simple way to fix things was to pass a bit more type
information in the HsExpr type, from the type checker to the desugarer.
That led to the non-local changes you can see.

On the way I fixed one other thing.  In various HsSyn constructors
there is a Type that is bogus (bottom) before the type checker, and
filled in with a real type by the type checker.  In one place it was
a (Maybe Type) which was Nothing before, and (Just ty) afterwards.
I've defined a type synonym HsTypes.PostTcType for this, and a named
bottom value HsTypes.placeHolderType to use when you want the bottom
value.

Fix the module import story to match what the Revised
Haskell Report says

1. 	Don't import qualified names of things that aren't imported

2.	Fix a bug that meant
		import A hiding( D )
	where D is a data constructor, didn't work.
	[The fix is to use IEVar not IEThingAbs in the
	want_hiding case of get_item in RnNames.filterImports

Rewire so that hsc.c files get built as part of cbits library.

Fix spacing

Two fixes:

1. Don't emit "native" any more.

2. Add import of mscorlib to the start of every output file.

Change access to errorHdrHook back into a foreign label (this is now
supported by the NCG, or should be, and in any case, we don't build
HSstd with the NCG).

Remove addrOf_ErrorHdrHook, as the NCG now can (or should) cope with
foreign labels, and in any case, we don't use the NCG to build the
standard library.

The motivation for this fix is preventing HSstd_cbits depending on the
RTS, so that it can be built as a DLL (for .NET) without needing to
get the RTS built as a DLL (that way lies madness).

Append final newline to _stub.{c,h} output

Prev commit which tried to get rid of the 'ineffective CPP'
stage broke an invariant/assumption made by DriverPipeline.genPipeline,
I'm afraid.

The invariant being that from the input filename to a compilation
pipeline, the start stage/phase can be uniquely determined
(via DriverPhases.startPhase). run_phase no longer guarantees
this, its result filename may now be equal to the input filename.
[This resulted in -M not working properly when -cpp wasn't also used].

Patch this up by having the input filename to a compilation pipeline
stage be tagged with the assumed suffix of the output. This is
really just papering over the cracks, the proper way to tidy this
up is to avoid having to do the two-stage compilation pipeline in
Main.main.compileFile, i.e., reconsider how OPTIONS pragmas are
handled. I decided not to try to do this now for fear of destabilising
HEAD even further.

runSomething: don't export it

run_phase: added tysig

Replace GhcLibToolsHcOpts with FptoolsHcOpts, and make it apply to all
programs in fptools, not just the hslibs tools. Now there's a way of
controlling compiler flags to all programs in the tree, so

a) by default all utilities should be optimised (before this was only done
for one or two like hsc2hs)

b) if you're doing development work, you can get everything built quicker by
setting FptoolsHcOpts appropriately

Don't add -O here; should be up to the user

Make ghc-pkg find its path on Windows

Fix spacing bogon.