[NFC] Separate bitcode reading for FUNC_CODE_INST_CMPXCHG(_OLD)
This is preparatory work to unable storing alignment for AtomicCmpXchgInst. See D83136 for context and bug: https://bugs.llvm.org/show_bug.cgi?id=27168 Differential Revision: https://reviews.llvm.org/D83375
Loading