[DebugMetadata][DwarfDebug] Don't retain local types with -fno-eliminate-unused-debug-types

[dzhidzhoev]

Summary

Don't retain local types in DICompileUnit, only attach them to the
corresponding subprogram, as it is more clear.

It's supposed to be committed along with https://reviews.llvm.org/D144006.

[nickdesaulniers]

Seems fine to me, but please triple check as the presubmit tests are failing.

Perhaps you meant to mark this as a parent or child revision in phab with your other change, so that the presubmit builds know to apply both?

See the box in the top right; Edit Related Revisions.

[dzhidzhoev]

In D158730#4614172, @nickdesaulniers wrote:

Seems fine to me, but please triple check as the presubmit tests are failing.

Perhaps you meant to mark this as a parent or child revision in phab with your other change, so that the presubmit builds know to apply both?

See the box in the top right; Edit Related Revisions.

Thanks! Added related revisions.

[dzhidzhoev]

Rebased on top of https://reviews.llvm.org/D155818.

[dblaikie]

Nice and easy