misched: fix RegionBegin when DebugValues get shuffled to the top.
assert (RemainingInstrs == 0 && "Instruction count mismatch!")
rdar://12776937.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169069 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineScheduler.cpp b/lib/CodeGen/MachineScheduler.cpp
index b3e38f6..cc7aabd 100644
--- a/lib/CodeGen/MachineScheduler.cpp
+++ b/lib/CodeGen/MachineScheduler.cpp
@@ -674,6 +674,8 @@
std::pair<MachineInstr *, MachineInstr *> P = *prior(DI);
MachineInstr *DbgValue = P.first;
MachineBasicBlock::iterator OrigPrevMI = P.second;
+ if (&*RegionBegin == DbgValue)
+ ++RegionBegin;
BB->splice(++OrigPrevMI, BB, DbgValue);
if (OrigPrevMI == llvm::prior(RegionEnd))
RegionEnd = DbgValue;