David Green eeddcba525 [RDA] Attempt to make RDA subreg aware ...

This attempts to make more of RDA aware of potentially overlapping
subregisters. Some of this was already in place, with it iterating
through MCRegUnitIterators. This also replaces calls to
LiveRegs.contains(..) with !LiveRegs.available(..), and updates the
isValidRegUseOf and isValidRegDefOf to search subregs.

Differential Revision: https://reviews.llvm.org/D107351

2021-08-04 14:21:32 +01:00

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