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Commit 0d4cebd4 authored by Matthias Braun's avatar Matthias Braun
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LiveInterval: Document and enforce rules about empty subranges. 

Empty subranges are not allowed in a LiveInterval and must be removed
instead: Check this in the verifiers, put a reminder for this in the
comment of the shrinkToUses variant for a single lane and make it
automatic for the shrinkToUses variant for a LiveInterval.

llvm-svn: 242431
parent 7f5ae19e
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