[SlotIndexes] Further pack indices to improve spill placement time (#182640) This patch makes it so that renumbering indices when inserting instructions into the SlotIndexes analysis renumbers the entire list if the list is otherwise densely packed. This fixes a case we saw on AArch64 with a lot of spills where every single spill instruction insertion required a renumbering of most of the instructions in a large function, making the operation approximately quadratic. This is not NFC as heuristics depend on the SlotIndex numbers, although this should mostly be a wash as LRs should be extended ~equally.
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