[llvm-branch-commits] [NFC][CrossDSOCFI] Move findCfiTypeIds to LowerTypeTests (PR #223582)

[Vitaly Buka via llvm-branch-commits]

https://github.com/vitalybuka created https://github.com/llvm/llvm-project/pull/223582

Move 64-bit numeric type identifier collection logic and extractNumericTypeId
from CrossDSOCFI.cpp into LowerTypeTests.cpp, exposing it as
lowertypetests::findCfiTypeIds in llvm/Transforms/IPO/LowerTypeTests.h.

Encapsulate Cross-DSO CFI type ID discovery so CrossDSOCFI no longer
directly parses cfi.functions metadata.

Metadata is accessed with:
- !type: global objects via GO.getMetadata(LLVMContext::MD_type)
- cfi.functions: operands 3..N containing !type MDNodes