[MemorySSA] Relax assert condition in createDefinedAccess

If globals-aa is enabled, because of the deletion of memory instructions, there
may be call instruction that is not in ModOrRefSet but is a MemoryUseOrDef.
This causes the crash in the process of cloning uses and defs.

Fixes https://github.com/llvm/llvm-project/issues/58719

Reviewed By: asbirlea

Differential Revision: https://reviews.llvm.org/D137553