Jay Foad b34ddfcc76 [SplitKit] In addDeadDef tolerate parent range that defines more lanes ...

Following on from D87757 "[SplitKit] Only copy live lanes", in
SplitEditor::addDeadDef, when we're checking whether the parent live
interval has a subrange defining the same lanes, tolerate the case
where the parent subrange defines a superset of the lanes. This can
happen when the child subrange comes from SplitEditor::buildCopy
decomposing a partial copy into a sequence of subreg copies that cover
the required lanes.

Differential Revision: https://reviews.llvm.org/D88020

2020-09-25 11:31:56 +01:00

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