Pengcheng Wang 9570bf978d [TableGen][MacroFusion] Predicate if the first inst has the same register (#137778) ...

We rename `SameReg` to `SecondInstHasSameReg ` and add
`FirstInstHasSameReg `
which has the logic but applies to the first instruction.

We have some cases that require the first instruction has the same
input/output register.

2025-05-13 19:05:42 +08:00

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