Rollup merge of #139550 - Urgau:rmeta-remap-path-scope, r=nnethercote

Fix `-Zremap-path-scope` rmeta handling

This PR fixes the conditional remapping (`-Zremap-path-scope`) of rmeta file paths ~~by using the `debuginfo` scope~~ by conditionally embedding the local path in addition to the remapped path.

Fixes rust-lang/rust#139217

Author: Zalathar