RFC: shark + llvm2.6svn LLVMContext api change

[Xerxes Rånby]

LLVM 2.6svn trunk now require the passing of a LLVMContext while 
creating a LLVM Module in order for LLVM clients to use the LLVM JIT  
multithreaded. [1]
Fortunate for us LLVM have also provided a new backward compatible API, 
by using getGlobalContext() a LLVMContext are returned that can be used 
by current singlethreaded compiler clients to quickly fullfill this 
change. [2]

I have added some comments to help future shark hackers find what needs 
to change if someone wants to make the shark compiler multi-threaded.

I have tested this patch using llvm r74781 and icedtea6 
http://icedtea.classpath.org/hg/icedtea6/rev/308c172cd230 on ia32 / F11

[1] http://lists.cs.uiuc.edu/pipermail/llvmdev/2009-June/023505.html - 
[LLVMdev] MAJOR API CHANGE: LLVMContext
[2] http://lists.cs.uiuc.edu/pipermail/llvmdev/2009-June/023507.html

Cheers
Xerxes



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