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Commit b3afad04 authored by Quentin Colombet's avatar Quentin Colombet
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[GlobalISel] Add a `X, Y = G_UNMERGE(G_ZEXT Z)` -> X = G_ZEXT Z; Y = 0 combine 

Add a combiner helper to transform unmerge of zext into one zext and
a constant 0

Differential Revision: https://reviews.llvm.org/D87427
parent d2321129
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