John McCall 18a2c2c0b9 Split out -Wconversion warnings about constant precision into their ...

own subcategory, -Wconstant-conversion, which is on by default.

Tweak the constant folder to give better results in the invalid
case of a negative shift amount.

Implements rdar://problem/6792488

llvm-svn: 118636

2010-11-09 22:22:12 +00:00

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