When calculating the ODR hash of a `FunctionNoProtoType` do not
include qualifiers derived from `FastTypeQuals`. These are only
defined in the constructor for `FunctionProtoType`:
https://github.com/llvm/llvm-project/blob/main/clang/lib/AST/Type.cpp#L3207
This change ensures the ODR hash and PCM output is stable for
any modules containing `FunctionNoProtoType`s.