[AMDGPU] Fix incorrect MachineMemOperand offsets and sizes in wide s_buffer_load splits (#189890) When G_AMDGPU_S_BUFFER_LOAD (or its SelectionDAG equivalent) falls back to MUBUF due to a divergent offset, wide loads (256-bit, 512-bit) are split into multiple 128-bit chunks. Both code paths that perform this split had bugs in how they annotated MachineMemOperand (MMO) metadata on each chunk instruction — reporting wrong offsets and wrong sizes. This does not affect generated assembly correctness but degrades the analysis if that MMO metadata is used. --------- Co-authored-by: Abhinav Garg <abhigarg@amd.com> Co-authored-by: Jay Foad <jay.foad@gmail.com>
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