[clang] [BoundsSafety] WIP: Make 'counted_by' work for pointer fields; late parsing for 'counted_by' on decl attr position (PR #87596)

[Bill Wendling via cfe-commits]

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bwendling wrote:

FYI: I'm planning on having a separate `test/Sema/attr-counted-by-for-pointers.c` test file for pointers and rename the current file something like `test/Sema/attr-counted-by-for-flexible-array-members.c`.

https://github.com/llvm/llvm-project/pull/87596