Teach tryEvaluate that fabs, copysign, and unary +/- are constants for
floats.
 - With testcase, which also has some other things GCC folds but we
   don't commented out in it.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@57624 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed