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[AArch64][GlobalISel] Optimize conjunctions of compares to conditiona…
…l compares. This is a partial port of the same optimization from AArch64ISelLowering, although the original handles more cases when generating regular compares instead of this one which just does it when selecting G_SELECTs. For more detailed comments see the original comments for emitConditionalComparison() in AArch64ISelLowering. Gives minor code size improvements. Differential Revision: https://reviews.llvm.org/D117166
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