[codeview] Ignore .cv_loc directives at the end of a function

If no data or instructions are emitted after a location directive, we
should clear the cv_loc when we change sections, or it will be emitted
at the beginning of the next section. This violates our invariant that
all .cv_loc directives belong to the same section. Add clearer
assertions for this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@330884 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed