[SelectionDAG] Look through FREEZE in getCopyToRegs when checking isZExtFree (#195285) When a narrow load i8 or i16 is frozen and its value crosses a basic block, `getCopyToRegs` emits `any_extend` instead of `zero_extend` because `isZExtFree` can't see through the `ISD::FREEZE` node. Example: https://godbolt.org/z/MYvjq8vPM contains an redundant `and w11, w11, 0xff` ``` ldrb w11, [x10], #1 cmp w11, #32 b.lo .LBB0_1 and w11, w11, #0xff ``` Fix this by passing the incoming node to the freeze to `isZExtFree` instead.
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