Eli Friedman b6befc3bc4 DCE math library calls with a constant operand. ...

On platforms which use -fmath-errno, math libcalls without any uses
require some extra checks to figure out if they are actually dead.

Fixes https://llvm.org/bugs/show_bug.cgi?id=30464 .

Differential Revision: https://reviews.llvm.org/D25970

llvm-svn: 285857

2016-11-02 20:48:11 +00:00

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