[NFC] New test case for BasicAA and memcy/memmove with deopt

New test checks results of BasicAA for llvm.memcpy.*/llvm.memmove.* intrinsics in presence of deopt bundle. By specification expected result for unrelated global memory should be Ref. Currently this is not the case and will be fixed in upcoming patches.

Reviewed By: fhahn

Differential Revision: https://reviews.llvm.org/D118031