New codegen failing test-cases

[Edward Z. Yang]

Hello Simon,

Have you gotten a chance to look at these two hunks? (see below)

Thanks,
Edward

Excerpts from Edward Z. Yang's message of Fri Dec 10 10:59:26 -0500 2010:
> Ok, I've got a patch that fixes this segfault.  In the process I looked
> at all patches to Cg* modules after Nov 2009 and looked for changes that
> weren't applied to the new codegen.  I skipped the LLVM patch, but picked
> up the rest of the blackhole changes.  There are, however, two hunks that
> I am not 100% sure how to translate.
> 
>     hunk ./compiler/codeGen/CgClosure.lhs 477
>     -         stmtC (CmmStore (CmmReg nodeReg) bh_info)
>     +         stmtsC [
>     +              CmmStore (cmmOffsetW (CmmReg nodeReg) fixedHdrSize)
>     +                       (CmmReg (CmmGlobal CurrentTSO)),
>     +              CmmCall (CmmPrim MO_WriteBarrier) [] [] CmmUnsafe CmmMayReturn,
>     +             CmmStore (CmmReg nodeReg) bh_info
>     +            ]
> 
> (the new code uses emits and a different format)
> 
>     hunk ./compiler/codeGen/CgStackery.lhs 20
>     -       pushUpdateFrame, emitPushUpdateFrame,
>     +       pushUpdateFrame, pushBHUpdateFrame, emitPushUpdateFrame,
> 
> A new pushBHUpdateFrame function was added, but I'm not sure how to translate
> this because the new codegenerator only reads out the offset from
> the FCode monad and there's no label to speak of.
> 
> Edward