[PATCH] D114952: [clang-cl] Define _MSVC_LANG for -std=c++2b

[Hans Wennborg via Phabricator via cfe-commits]

hans accepted this revision.
hans added a comment.
This revision is now accepted and ready to land.

lgtm


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D114952/new/

https://reviews.llvm.org/D114952