Cherry-pick: [AVR] Fix expanding MOVW for overlapping registers #141
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When expanding a MOVW (16-bit copy) to two MOVs (8-bit copy), the lower byte always comes first. This is incorrect for corner cases like '$r24r23 -> $r25r24', in which the higher byte copy should come first. Current patch fixes that bug as recorded at rust-lang/rust#98167 Reviewed By: benshi001 Differential Revision: https://reviews.llvm.org/D128588
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Cherry-pick of llvm@5650688 (accepted & merged in https://reviews.llvm.org/D128588) that'll fix rust-lang/rust#98167.