[clang] [llvm] [clang][llvm]Uncorrelate CFI and Callgraph related type metadata annotations (PR #204266)

[Peter Collingbourne via cfe-commits]

https://github.com/pcc commented:

+1 to the idea that these metadata annotations should be separate. They should not have used the same metadata kind in the first place. Arguably we should rename `!type` to `!cfi_type` to reduce confusion.

https://github.com/llvm/llvm-project/pull/204266