[opt] Introduce -strip-named-metadata

This renames and generalizes -strip-module-flags to erase all named
metadata from a module. This makes it easier to diff IR.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@333977 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed