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This is an updated version which fixes a bug that happened with uses tied to an earlyclobber operand which end at an unusual slotindex. If two definitions write to independent subregisters then they can be put in any order. LiveIntervalAnalysis::handleMove() did not support this previously because it looks like moving a definition of a vreg past another one. This is a modified version of a patch proposed (two years ago) by Vincent Lejeune! This version does not touch the read-undef flags and is extended for the case of moving a subregister def behind all uses - this can happen for subregister defs that are completely unused. Differential Revision: http://reviews.llvm.org/D9067 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@260906 91177308-0d34-0410-b5e6-96231b3b80d8
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