[clang] -fsanitize=function: fix MSVC hashing to sugared type (PR #66816)

[Tobias Hieta via cfe-commits]

tru wrote:

We guarantee abi/api stability between the patch versions, so I would say no. Maybe if we think it's critical enough we could do a 17.1.0, but this doesn't seem to be the case when reading the description at least. Is this a regression from LLVM 16?

I could be convinced, but my default outlook would be NO abi/api breaks unless absolutely 100% necessary.

https://github.com/llvm/llvm-project/pull/66816