[AMDGPU] Lower mem intrinsics on LDS pointers in AMDGPUSwLowerLDS (#202552)
memcpy/memset/memmove on LDS pointers were left in the local address
space, silently writing into the malloc'ed pointer LDS cell instead of
the global buffer backing the lowered LDS
Collect and translate them to the global pointer like the other LDS
memory operations under asan