AMDGPU: Do not generate non-temporal hint when Load_Tr intrinsic did not specify it (#79104)

int_amdgcn_global_load_tr did not specify non-temporal load transpose,
thus we should
not genetrate the non-temporal hint for the load. We need to implement
getTgtMemIntrinsic
to create the corresponding MemSDNode. And we don't set the non-temporal
flag because
the intrinsic did not specify it.

NOTE: We need to implement getTgtMemIntrinsic for any memory intrinsics.