Move KCFI type ID hash helpers out of LLVMSupport (#196784)
PR #167254 inappropriately introduced llvm/Support/Hash.{h,cpp} for the
KCFI helpers. The name is misleading — it has nothing to do with the
generic hashing facility in llvm/ADT/Hashing.h — and KCFI is a
CodeGen/IR feature that does not belong in the foundational Support
layer.
Move the files to llvm/lib/Transforms/Utils/KCFIHash.cpp, alongside
setKCFIType, which is the only existing KCFI helper in TransformUtils.
Also relocate the deprecated pre-xxh3 xxHash64 implementation into
KCFIHash.cpp, the sole user. clang/test/CodeGen/kcfi-generalize.c and
kcfi-normalize.c are end-to-end regression tests for the xxHash64 output
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