Matthias Braun 9d362ec2a4 [SimplifyLibCalls] Enable double to float shrinking for copysign
rdar://19049359

Differential Revision: http://reviews.llvm.org/D6495

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223269 91177308-0d34-0410-b5e6-96231b3b80d8
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