Revert "[AMDGPU][Scheduler] Refactor ArchVGPR rematerialization during scheduling (#125885)" (#139341)
And related "[AMDGPU] Regenerate mfma-loop.ll test"
Introduce memory error detected by Asan #125885.
This reverts commit 382a085a95b0abeac77b150b7b644b372bd08e78.
This reverts commit 067caaafb58a156d0d77229422607782a639f5b5.