Similarly to what already being done in GVN (fb632ed2377d280b581b8d4653b855e60d611f77),
when a dominating equality condition of two pointers holds, and the
value being stored is implied by such a condition, ensure the store
may be removed by leveraging `canReplacePointersIfEqual`, subject to
the known approximations.
Fixes: https://github.com/llvm/llvm-project/issues/184088.
e7db3f1d3d