Enhance 'diagtool list-warnings' to report number of diagnostics covered directly under -Wpedantic, and enhance warning-flags.c test to test that this set does not grow.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159893 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed