Reland "[MC][AsmParser] Diagnose improperly nested .cfi frames"

This showed up when simplifying some large testcase, where the cfi directives
became out of sync with the proc's they enclose.

Now restricted to platforms that support .subsections_via_symbols.

This reverts commit 797b68c0.

Fixes: #72802

Differential revision: https://reviews.llvm.org/D153167

rdar://111459507