4df6d3df24
This PR aims to reland work done by @arsenm which was previously reverted due to some tangentially related scheduler issues as discussed on #76416. This PR cherry-picks the original commit (0e46b49de433), and adds another patch on top with the following changes: * The code in `updateRegDefsUses` now updates subranges when subreg-liveness-tracking is enabled. * When adding an implicit-def operand for the super-register, the code in `reMaterializeTrivialDef` which tries to remove undefined subranges should now take into account that the lanes from the super-reg are no longer undefined. Co-authored-by: Matt Arsenault <Matthew.Arsenault@amd.com>
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