[llvm] [ProfileData] Preserve cross-image targets in concatenated raw profiles (PR #212715)

[Karim Alweheshy via llvm-commits]

karim-alweheshy wrote:

@mingmingl-llvm Could you please review this `InstrProfReader` change? It builds one symbol table across concatenated raw-profile headers so indirect-call and vtable targets owned by another image can resolve. The regression covers both target kinds plus malformed value-data sizing; fresh exact-head CI is running after a metadata-only author-email correction.

https://github.com/llvm/llvm-project/pull/212715