Update to LLVM 3.5a.

Change-Id: Ifadecab779f128e62e430c2b4f6ddd84953ed617
diff --git a/lib/CodeGen/RegAllocFast.cpp b/lib/CodeGen/RegAllocFast.cpp
index e92dbd2..8dc44f5 100644
--- a/lib/CodeGen/RegAllocFast.cpp
+++ b/lib/CodeGen/RegAllocFast.cpp
@@ -144,23 +144,23 @@
     // not be erased.
     bool isBulkSpilling;
 
-    enum LLVM_ENUM_INT_TYPE(unsigned) {
+    enum : unsigned {
       spillClean = 1,
       spillDirty = 100,
       spillImpossible = ~0u
     };
   public:
-    virtual const char *getPassName() const {
+    const char *getPassName() const override {
       return "Fast Register Allocator";
     }
 
-    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+    void getAnalysisUsage(AnalysisUsage &AU) const override {
       AU.setPreservesCFG();
       MachineFunctionPass::getAnalysisUsage(AU);
     }
 
   private:
-    bool runOnMachineFunction(MachineFunction &Fn);
+    bool runOnMachineFunction(MachineFunction &Fn) override;
     void AllocateBasicBlock();
     void handleThroughOperands(MachineInstr *MI,
                                SmallVectorImpl<unsigned> &VirtDead);
@@ -224,7 +224,7 @@
 
   // Check that the use/def chain has exactly one operand - MO.
   MachineRegisterInfo::reg_nodbg_iterator I = MRI->reg_nodbg_begin(MO.getReg());
-  if (&I.getOperand() != &MO)
+  if (&*I != &MO)
     return false;
   return ++I == MRI->reg_nodbg_end();
 }
@@ -585,12 +585,12 @@
          "Not a virtual register");
   LiveRegMap::iterator LRI;
   bool New;
-  tie(LRI, New) = LiveVirtRegs.insert(LiveReg(VirtReg));
+  std::tie(LRI, New) = LiveVirtRegs.insert(LiveReg(VirtReg));
   if (New) {
     // If there is no hint, peek at the only use of this register.
     if ((!Hint || !TargetRegisterInfo::isPhysicalRegister(Hint)) &&
         MRI->hasOneNonDBGUse(VirtReg)) {
-      const MachineInstr &UseMI = *MRI->use_nodbg_begin(VirtReg);
+      const MachineInstr &UseMI = *MRI->use_instr_nodbg_begin(VirtReg);
       // It's a copy, use the destination register as a hint.
       if (UseMI.isCopyLike())
         Hint = UseMI.getOperand(0).getReg();
@@ -618,7 +618,7 @@
          "Not a virtual register");
   LiveRegMap::iterator LRI;
   bool New;
-  tie(LRI, New) = LiveVirtRegs.insert(LiveReg(VirtReg));
+  std::tie(LRI, New) = LiveVirtRegs.insert(LiveReg(VirtReg));
   MachineOperand &MO = MI->getOperand(OpNum);
   if (New) {
     LRI = allocVirtReg(MI, LRI, Hint);