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Summary: This change adds `LLVM_CONSTEXPR` to functions selected as follows: - the body is already valid under C++11 for a `constexpr` function, - the evaluation of the function, given constant arguments, will not fail during the evaluation of a constant expression, and - the above properties are easily verifiable at a glance. Note: the evaluation of the function cannot fail if the instantiation triggers a static assertion failure. Reviewers: faisalv, rsmith, aaron.ballman Subscribers: cfe-commits Differential Revision: https://reviews.llvm.org/D22824 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277269 91177308-0d34-0410-b5e6-96231b3b80d8
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