Add an extra operand to LABEL nodes which distinguishes between debug, EH, or misc labels. This fixes the EH breakage. However I am not convinced this is *the* solution.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46609 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/MachineModuleInfo.cpp

@@ -1914,7 +1914,7 @@ bool DebugLabelFolder::runOnMachineFunction(MachineFunction &MF) {
     // Iterate through instructions.
     for (MachineBasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ) {
       // Is it a label.
-      if ((unsigned)I->getOpcode() == TargetInstrInfo::LABEL) {
+      if (I->isDebugLabel()) {
         // The label ID # is always operand #0, an immediate.
         unsigned NextLabel = I->getOperand(0).getImm();