[clang] Remove legacy -m(no)-code-object-v3 options

Code object V2 and V3 have been deprecated for a long time.
They're now scheduled to be removed completely from LLVM in the coming weeks/months.

There is no reason to support those legacy options anymore as they've
also been deprecated for a long time.

Reviewed By: #amdgpu, yaxunl, artem.tamazov

Differential Revision: https://reviews.llvm.org/D145671