[clang] alloc_align attribute crashes if applied to a function pointer

[MacDue]

Reproducer:

void aa_fn_ptr(int* (*fn_ptr)(int)  __attribute__((alloc_align(1))));

Compile with clang (any options)

CE: https://godbolt.org/z/z81edvhWs

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: Benjamin Maxwell (MacDue)

Reproducer: ``` void aa_fn_ptr(int* (*member)(int) __attribute__((alloc_align(1)))); ``` Compile with clang (any options)

CE: https://godbolt.org/z/14zxWYdM4

[llvmbot]

@llvm/issue-subscribers-bug

Author: Benjamin Maxwell (MacDue)

Reproducer: ``` void aa_fn_ptr(int* (*member)(int) __attribute__((alloc_align(1)))); ``` Compile with clang (any options)

CE: https://godbolt.org/z/14zxWYdM4