[PATCH] D148509: [BranchFolder] Skip redundant IMPLICIT_DEFs of subregs

[Jay Foad via Phabricator via llvm-commits]

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In D148509#4277337 <https://reviews.llvm.org/D148509#4277337>, @arsenm wrote:

> This is another place that should be converted to use regunits. We'd then have to go backwards from live reg units to covering registers

Wouldn't it be better to convert basic block liveins to use regunits first, so that there would be no need to go backwards?


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