wire up comment diagnostics to -Wcomment, add it to -Wall.  Now
you can silence these with -Wno-all or -Wno-comment, but they
still default to on.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@69372 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed