[lld-macho][nfc] Avoid using absolute addresses in cgprofile-icf.s

If we fix https://github.com/llvm/llvm-project/issues/54184, the
`dyld_stub_binder` symbol will get included in every output dylib. This
would cause the addresses of the other symbols to shift, breaking the
test as it currently stands. Let's make the test more flexible.

Reviewed By: lgrey

Differential Revision: https://reviews.llvm.org/D120940