Jay Foad 21e1b13f33 [TwoAddressInstruction] Handle physical registers with LiveIntervals (#66784) ...

Teach the LiveIntervals path in isPlainlyKilled to handle physical
registers, to get equivalent functionality with the LiveVariables path.

Test this by adding -early-live-intervals RUN lines to a handful of
tests that would fail without this.

2023-10-19 16:26:30 +01:00

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