Update private_typeinfo's `is_equal` implementation after r361913

The libc++ typeinfo implementation is being improved to better
handle non-merged type names.

This patch takes advantage of that more correct behavior by delegating
to std::type_infos default operator== instead of doing pointer equality

However, libc++ still expects unique RTTI by default, and so we
should still fall back to strcmp when explicitly requested.

git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@361916 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed