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Fix a type-error in desugaring TH code

Asynchronous / non-blocking I/O for Win32 platforms.

This commit introduces a Concurrent Haskell friendly view of I/O on
Win32 platforms. Through the use of a pool of worker Win32 threads, CH
threads may issue asynchronous I/O requests without blocking the
progress of other CH threads. The issuing CH thread is blocked until
the request has been serviced though.

GHC.Conc exports the primops that take care of issuing the
asynchronous I/O requests, which the IO implementation now takes
advantage of. By default, all Handles are non-blocking/asynchronous,
but should performance become an issue, having a per-Handle flag for
turning off non-blocking could easily be imagined&introduced.

[Incidentally, this thread pool-based implementation could easily be
extended to also allow Haskell code to delegate the execution of
arbitrary pieces of (potentially blocking) external code to another OS
thread. Given how relatively gnarly the locking story has turned out
to be with the 'threaded' RTS, that may not be such a bad idea.]

deja vu all over again

* Nuked unused --with-glut-api and --with-glut-xlib arguments
* Only check for OpenGL headers and libs when --enable-hopengl is given

typo

-------------------------------------
      Add Core Notes and the {-# CORE #-} pragma
	-------------------------------------

This is an idea of Hal Daume's. The key point is that Notes in Core
are augmented thus:

  data Note
    = SCC CostCentre
    | ...
    | CoreNote String     -- NEW

These notes can be injected via a Haskell-source pragma:

   f x = ({-# CORE "foo" #-} show) ({-# CORE "bar" #-} x)

This wraps a (Note (CoreNote "foo")) around the 'show' variable,
and a similar note around the argument to 'show'.

These notes are basically ignored by GHC, but are emitted into
External Core, where they may convey useful information.

Exactly how code involving these notes is munged by the simplifier
isn't very well defined.  We'll see how it pans out.  Meanwhile
the impact on the rest of the compiler is minimal.

Document {-# CORE #-} pragma (thanks to Hal Daume)

Import pruning

Add comments

Comments and imports only

closureSatisfiesConstraints: check whether the retainer set is valid
before attempting to match it against a constraint.  It might not be
valid if the object is an ex-weak-pointer which was finalized after
the last GC.

MERGE TO STABLE

-------------------------------------
	   Complete an earlier TH commit
	-------------------------------------

In this earlier commit:

  3.  Ensure that a declaration quotation [d| ... |] does not have a
      permanent effect on the instance environment. (A TH fix.)

I had forgotten to do a stage2 compile.  This commit just completes
the earlier work.  I moved some code from TcExpr (long) to TcSplice
(shorter) which had the happy effect of bringing related code together.

-------------------------------------
   Generate correct dependencies when reading External Core
	-------------------------------------

We have to be more careful than I realised when doing strongly-connected
component analysis of type/class decls when reading External Core.

Here's the relevant new comment:

--		Building edges for SCC analysis
--
-- When building the edges, we treat the 'main name' of the declaration as the
-- key for the node, but when dealing with External Core we may come across
-- references to one of the implicit names for the declaration.  For example:
--	class Eq a where ....
--	data :TSig a = :TSig (:TEq a) ....
-- The first decl is sucked in from an interface file; the second
-- is in an External Core file, generated from a class decl for Sig.
-- We have to recognise that the reference to :TEq represents a
-- dependency on the class Eq declaration, else the SCC stuff won't work right.
--
-- This complication can only happen when consuming an External Core file
--
-- Solution: keep an "EdgeMap" (bad name) that maps :TEq -> Eq.
-- Don't worry about data constructors, because we're only building
-- SCCs for type and class declarations here.  So the tiresome mapping
-- is need only to map   [class tycon -> class]

Part 2 of fix :i in InteractiveUI

Comments only

Another datacon-naming wibble

Fix :i in InteractiveUI

Eliminate brain-dead outputC pattern-match failure

Eliminate bogus string-literal duplication

Compile binary stuff with -O always

Add -fvia-C to utils/Panic_HC_OPTS, and remove it from main/Main_HC_OPTS.

odir-ify prelude/PrimOp.o dependency

Document phase control

-------------------------------------
	 	Two minor wibbles
	-------------------------------------


1.  Make the generic toT/fromT Ids for "generic derived classes" into
    proper ImplicitIds, with their own GlobalIdDetails. This makes it
    easier to identify them.  (The lack of this showed up as a bug
    when I made an apparently-innocuous other change.)

2.  Distinguish ClassOpIds from RecordSelIds in their GlobalIdDetails.
    They are treated differently here and there, so I made this change
    as part of (1)

3.  Ensure that a declaration quotation [d| ... |] does not have a
    permanent effect on the instance environment. (A TH fix.)

Wibbles to the new datacon story; fixes ds002

Add note to description of -no-hs-main: it forces linking in --make
mode too.

If -no-hs-main is specified in --make mode, attempt linking even when
there's no Main module.

Fixes bug #686620

MERGE TO STABLE

Support strictness annotations on data declarations and support the record
and infix constructors. Also tweaked the pretty printer a bit.

Remove un-necessary case

-------------------------------------
	 	Two minor wibbles
	-------------------------------------

[These two unrelated fixes just got tangled together in my tree.]

1.  Fix a crash when a class op is used as a record selector

2.  Fix a wibble related to the new DataCon naming story.
    In tcId, treat the DataCon case entirely separately, because
    its "stupid context" doesn't show up in its type.

    On the way, remove the DataCon cases in tcLookupId and tcLookupGlobalId
    The should not be necessary.  He says hopefully.

Cosmetic wibble

Comments only

Fix build on GHC < 5.00

make use of MBLOCK_ROUND_DOWN()

arenaAlloc(): tidy up alignment calc

More notes about building on Win32

Use hasktags by default

Restore interrupt/quit signal handlers after every evaluation in GHCi,
just in case the program set its own.

Comment change only

GHC is pre-supposed in order to build GHC.  We weren't making this
nearly as explicit as it should have been.