PeepholeOpt: Handle subregister compose when looking through reg_sequence (#127051) Previously this would give up on folding subregister copies through a reg_sequence if the input operand already had a subregister index. d246cc618adc52fdbd69d44a2a375c8af97b6106 stopped introducing these subregister uses, and this is the first step to lifting that restriction. I was expecting to be able to implement this only purely with compose / reverse compose, but I wasn't able to make it work so relies on testing the lanemasks for whether the copy reads a subset of the input.
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