[clang] Capture Framework when HeaderSearch is resolved via headermap

When building frameworks, headermaps responsible for mapping angle-included headers to their source file location are passed via
`-I` and not `-index-header-map`. Also, `-index-header-map` is only used for indexing purposes and not during most builds.
This patch holds on to the framework's name in HeaderFileInfo as this is retrieveable for cases outside of IndexHeaderMaps and
still represents the framework that is being built.

resolves: rdar://84046893

Reviewed By: jansvoboda11

Differential Revision: https://reviews.llvm.org/D111468