SuccessChanges

Summary

  1. [libc++][test] Use <version> to get config on MSVC (details)
Commit 6f0768f64da398d5103d39e83bdc66a5ffd6f0f6 by Casey
[libc++][test] Use <version> to get config on MSVC
...instead of `<ciso646>`.
Also includes some NFC comment changes.
llvm-svn: 374854
The file was modifiedlibcxx/test/support/test_macros.h
The file was modifiedlibcxx/test/support/msvc_stdlib_force_include.h
The file was modifiedlibcxx/test/support/test_workarounds.h