Extended Description

This crashes the original testcase when http://reviews.llvm.org/D20304 is applied.

A reduced version hits a verifier error instead after scheduling.

llc: /home/matt/src/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp:1066: void llvm::LiveIntervals::HMEditor::handleMoveDown(llvm::LiveRange&): Assertion `OldIdxVNI->def == OldIdxOut->start && "Inconsistent def"' failed.

Program received signal SIGABRT, Aborted.
0x00007ffff671e295 in raise () from /usr/lib/libc.so.6
(gdb) bt
#​0 0x00007ffff671e295 in raise () from /usr/lib/libc.so.6
#​1 0x00007ffff671f6da in abort () from /usr/lib/libc.so.6
#​2 0x00007ffff6717297 in __assert_fail_base () from /usr/lib/libc.so.6
#​3 0x00007ffff6717342 in __assert_fail () from /usr/lib/libc.so.6
#​4 0x0000000001d74af7 in llvm::LiveIntervals::HMEditor::handleMoveDown (this=0x7fffffffca00, LR=...) at /home/matt/src/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp:1066
#​5 0x0000000001d7465a in llvm::LiveIntervals::HMEditor::updateRange (this=0x7fffffffca00, LR=..., Reg=2147484174, LaneMask=0) at /home/matt/src/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp:996
#​6 0x0000000001d74394 in llvm::LiveIntervals::HMEditor::updateAllRanges (this=0x7fffffffca00, MI=0x46a3ec0) at /home/matt/src/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp:964
#​7 0x0000000001d71bc2 in llvm::LiveIntervals::handleMove (this=0x461bd00, MI=..., UpdateFlags=true) at /home/matt/src/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp:1380
#​8 0x0000000001e23f1d in llvm::ScheduleDAGMI::moveInstruction (this=0x46dd0d0, MI=0x46a3ec0, InsertPos=...) at /home/matt/src/llvm/lib/CodeGen/MachineScheduler.cpp:655
#​9 0x0000000001e279f1 in llvm::ScheduleDAGMILive::scheduleMI (this=0x46dd0d0, SU=0x46ecbc0, IsTopNode=false) at /home/matt/src/llvm/lib/CodeGen/MachineScheduler.cpp:1327
#​10 0x0000000001e26973 in llvm::ScheduleDAGMILive::schedule (this=0x46dd0d0) at /home/matt/src/llvm/lib/CodeGen/MachineScheduler.cpp:1122
#​11 0x0000000001e23690 in (anonymous namespace)::MachineSchedulerBase::scheduleRegions (this=0x461c650, Scheduler=..., FixKillFlags=false) at /home/matt/src/llvm/lib/CodeGen/MachineScheduler.cpp:492
#​12 0x0000000001e22a52 in (anonymous namespace)::MachineScheduler::runOnMachineFunction (this=0x461c650, mf=...) at /home/matt/src/llvm/lib/CodeGen/MachineScheduler.cpp:357
#​13 0x0000000001decb98 in llvm::MachineFunctionPass::runOnFunction (this=0x461c690, F=...) at /home/matt/src/llvm/lib/CodeGen/MachineFunctionPass.cpp:60
#​14 0x00000000020f2957 in llvm::FPPassManager::runOnFunction (this=0x45d1d80, F=...) at /home/matt/src/llvm/lib/IR/LegacyPassManager.cpp:1526
#​15 0x00000000020f2ace in llvm::FPPassManager::runOnModule (this=0x45d1d80, M=...) at /home/matt/src/llvm/lib/IR/LegacyPassManager.cpp:1547
#​16 0x00000000020f2e1b in (anonymous namespace)::MPPassManager::runOnModule (this=0x45ed4b0, M=...) at /home/matt/src/llvm/lib/IR/LegacyPassManager.cpp:1603
#​17 0x00000000020f34cd in llvm::legacy::PassManagerImpl::run (this=0x45e9c40, M=...) at /home/matt/src/llvm/lib/IR/LegacyPassManager.cpp:1706
#​18 0x00000000020f36d9 in llvm::legacy::PassManager::run (this=0x7fffffffd5a0, M=...) at /home/matt/src/llvm/lib/IR/LegacyPassManager.cpp:1737
#​19 0x0000000000d2bcfe in compileModule (argv=0x7fffffffdfe8, Context=...) at /home/matt/src/llvm/tools/llc/llc.cpp:465
#​20 0x0000000000d2a804 in main (argc=8, argv=0x7fffffffdfe8) at /home/matt/src/llvm/tools/llc/llc.cpp:244