Chad Rosier 4e89d97e3a Add support for using MVN to materialize negative constants.
rdar://10412592

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144348 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-11 00:36:21 +00:00
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