Jacob Gravelle 40aefb5fe0 Declare lgamma library builtins as never being const
Summary:
POSIX requires lgamma writes to an external global variable, signgam.
This prevents annotating lgamma with readnone, which is incorrect on
targets that write to signgam.

Reviewers: efriedma, rsmith

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D29778

llvm-svn: 295781
2017-02-21 22:37:27 +00:00
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