[CodeGen] Correctly handle non-standard cases in RemoveLoadsIntoFakeUses (#111551) In the RemoveLoadsIntoFakeUses pass, we try to remove loads that are only used by fake uses, as well as the fake use in question. There are two existing errors with the pass however: it incorrectly examines every operand of each FAKE_USE, when only the first is relevant (extra operands will just be "killed" regs assigned by a previous pass), and it ignores cases where the FAKE_USE register is not an exact match for the loaded register, which is incorrect as regalloc may choose to load a wider value than the FAKE_USE required pre-regalloc. This patch fixes both of these cases.
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