[patch] RFC: shark llvm 2.6svn r73431 api breakage fix

[Xerxes Rånby]

http://lists.cs.uiuc.edu/pipermail/llvmdev/2009-June/023073.html
Add Sub Mul Neg have been split into FAdd FSub FMul FNeg for improved 
integer / floatingpoint operation
    llvm_api_breakage.patch
improves floatingpoint performance by taking advandtage of this change.

The llvm 2.6svn tip have improved support for vector types since r73431 
and some api's have changed to return Constant* instead of ConstantFP*
    llvm_api_breakage_2.patch
fixes this issue.

Cheers
Xerxes
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