Move block/unblockAsyncExceptions here, now that they're used in PrelHandle.

This commit fixes the trace/stderr problem, and also fixes some other
problems with the I/O library.

	- handles now contain a list of free buffers, which are
	  guaranteed to be the same size as the primary handle buffer.

	- hPutStr now doesn't evaluate any part of the input string with
	  the handle locked.  Instead, it acquires a buffer from the handle
	  copies characters into it, then commits the buffer.  This is
	  better for concurrency too, because the handle is only locked
	  while we're actually reading/writing, not while evaluating.

	- there were an even number of off-by-one errors in the I/O system
	  which compensated for each other.  This has been fixed.

	- made the I/O subsystem a little more exception-safe.  It still
	  isn't totally exception-safe, but I can't face doing that
	  without a complete rewrite of this thing in Haskell.

	- add hPutBufFull and hGetBufFull.  The compiler probably needs to
	  be updated to use these too.

add takeMaybeMVarzh_fast decl.

add takeMaybeMVarzh_fast

add takeMaybeMVar

add takeMaybeMVar#

hack to fix bootstrapping

Add takeMaybeMVarzh  (I'm doing this commit in bits, since my working
sources are so full of changes I can't easily unpick them...)

Cleaned up Addr, AddrOff added

Add -fcompiling-prelude so as to get right dependencies in the interface.

Cygwin wibbles.

More infotable cleanups: zap the debugging table of info table names.
This can be cleanly done by looking at the .itbl field on Names and Tycons.

checkClosureShallow: allow Hugs constructor itbls

Cleaning up the foreign object naming mess:

   * Renamed the primop from makeForeignObj# to mkForeignObj#, this
     is more consistent with the old Foreign.mkForeignObj.

   * PrelForeign now exports makeForeignObj with the new signature.

   * freeFile.c now uses StgAddr instead of StgForeignObj, this
     removes the need for some fixIOs.

   * Lots of import tweaking to prepare The Big Foreign Renamer,
     which will move most of Foreign to ForeignObj, and FFI to Foreign.

Note: I've tried to track the changes in the interpreter sources, but
didn't test them.

Pull init_stack outside #ifdef INTERPRETER.

Fix bitrot to allow (standalone) StgHugs to be built on Solaris, so we
can Purify it.

Ensure that when Hugs decides to unload a module (nukeModule()), there are
no closures anywhere in the system which refers to infotables defined
in that module.  That means reverting all CAFs and doing a major GC
prior to deleting the module.  A flag is used to avoid redundant GCs.

Render formatting consistent with the Glasgow Style (vapour-)Guide.

remove syslib misc.

not the dmgob_ guys; we don't have the Native library anymore.

syslib wibble

don't try to recurse into non-directories.

update expected output

update expected output

Use STArray instead of MutableArray.

update expected output.

oops, this output is bogus.

update expected output

update expected output

Update for Haskell 1.4 (!!!) and update expected output.

String isn't a valid _ccall_ argument type anymore.

Add io subdir

Wibble

Add nested hPutStr/tracing test

When building way=u, merge cbits/*.o into ./libHS_cbits.u_o, for Hugs.

Make it so that -fcompiling-prelude applies only
for Prelude modules (i.e. ones called Prelxxx).

I've done this with an {-# OPTIONS #-} line in each
such module (they all has -fno-implicit-prelude anyway)
but a less repetitive approach in the Makefile would
be welcome.

Load the compiled Prelude directly from its build location, ghc/lib/std.

Update EXTERN_SYMS_linux/EXTERN_SYMS_ALLPLATFORMS to fix Win32 build.

Make getArgs and getProgName behave identically in combined and standalone
modes.

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