move handling of -pedantic and -pedantic-errors into Diagnostics,
out of Warnings.cpp.  This simplifies warnings.cpp and makes it more
efficient.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@69266 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed