Chris Lattner 51924e517b Implement support for -fwrapv, rdar://7221421 ...

As part of this, pull together trapv handling into the same enum.

This also add support for NSW multiplies.

This also makes PCH disagreement on overflow behavior silent, since it
really doesn't matter except for warnings and codegen (no macros get 
defined etc).

llvm-svn: 106956

2010-06-26 21:25:03 +00:00

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