Mark free functions size/empty/data conditionally noexcept.

llvm-svn: 318432
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: d1dcda19695afbbd7d3a245bec607be2f09492f7
1 file changed