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/MachineInstr.cpp

@@ -18,6 +18,7 @@
 #include "llvm/CodeGen/PseudoSourceValue.h"
 #include "llvm/CodeGen/SelectionDAGNodes.h"
 #include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetInstrInfo.h"
 #include "llvm/Target/TargetInstrDesc.h"
 #include "llvm/Target/MRegisterInfo.h"
 #include "llvm/Support/LeakDetector.h"
@@ -512,6 +513,12 @@ unsigned MachineInstr::getNumExplicitOperands() const {
 }
 
 
+/// isDebugLabel - Returns true if the MachineInstr represents a debug label.
+///
+bool MachineInstr::isDebugLabel() const {
+  return getOpcode() == TargetInstrInfo::LABEL && getOperand(1).getImm() == 0;
+}
+
 /// findRegisterUseOperandIdx() - Returns the MachineOperand that is a use of
 /// the specific register or -1 if it is not found. It further tightening
 /// the search criteria to a use that kills the register if isKill is true.