Revert "[WebAssembly] Handle debug information and virtual registers without crashing"

This reverts commit r278967, since the new test is failing when you
don't build the WebAssembly target (most people, since it's
off-by-default).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@278973 91177308-0d34-0410-b5e6-96231b3b80d8

Author: dexonsmith

lib/Target/WebAssembly/WebAssemblyRegStackify.cpp

@@ -255,7 +255,7 @@ static bool HasOneUse(unsigned Reg, MachineInstr *Def,
   const VNInfo *DefVNI = LI.getVNInfoAt(
       LIS.getInstructionIndex(*Def).getRegSlot());
   assert(DefVNI);
-  for (auto &I : MRI.use_nodbg_operands(Reg)) {
+  for (auto I : MRI.use_nodbg_operands(Reg)) {
     const auto &Result = LI.Query(LIS.getInstructionIndex(*I.getParent()));
     if (Result.valueIn() == DefVNI) {
       if (!Result.isKill())
@@ -360,7 +360,7 @@ static bool OneUseDominatesOtherUses(unsigned Reg, const MachineOperand &OneUse,
   const MachineInstr *OneUseInst = OneUse.getParent();
   VNInfo *OneUseVNI = LI.getVNInfoBefore(LIS.getInstructionIndex(*OneUseInst));
 
-  for (const MachineOperand &Use : MRI.use_nodbg_operands(Reg)) {
+  for (const MachineOperand &Use : MRI.use_operands(Reg)) {
     if (&Use == &OneUse)
       continue;
 

lib/Target/WebAssembly/WebAssemblyReplacePhysRegs.cpp

@@ -88,8 +88,6 @@ bool WebAssemblyReplacePhysRegs::runOnMachineFunction(MachineFunction &MF) {
         if (VReg == WebAssembly::NoRegister)
           VReg = MRI.createVirtualRegister(RC);
         MO.setReg(VReg);
-        if (MO.getParent()->isDebugValue())
-          MO.setIsDebug();
         Changed = true;
       }
     }

lib/Target/WebAssembly/WebAssemblyStoreResults.cpp

@@ -90,7 +90,7 @@ static bool ReplaceDominatedUses(MachineBasicBlock &MBB, MachineInstr &MI,
 
   SmallVector<SlotIndex, 4> Indices;
 
-  for (auto I = MRI.use_nodbg_begin(FromReg), E = MRI.use_nodbg_end(); I != E;) {
+  for (auto I = MRI.use_begin(FromReg), E = MRI.use_end(); I != E;) {
     MachineOperand &O = *I++;
     MachineInstr *Where = O.getParent();