Jakob Stoklund Olesen 28792c4a3d When RemoveCopyByCommutingDef is creating additional identity copies, just use ...

LiveInterval::MergeValueNumberInto instead of trying to extend LiveRanges and
getting it wrong.

This fixed PR8249 where a valno with a multi-segment live range was defined by
an identity copy created by RemoveCopyByCommutingDef. Some of the live
segments disappeared.

llvm-svn: 115385

2010-10-01 23:52:25 +00:00

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