std:: quailfy the calls for cend/crend/cbegin/cend. Fixes bug 28927.

llvm-svn: 278282
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 7725546a3263b81a792895aaa348d310263118ad
2 files changed