Matthias Braun 0d4cebd434 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

2015-07-16 18:55:35 +00:00

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