First pass at emitIAS for branches and binding labels

src/assembler_ia32.h

Index: src/assembler_ia32.h
diff --git a/src/assembler_ia32.h b/src/assembler_ia32.h
index bb3f0ab63b2e439eecf7411720f0bc9fa9c44deb..b1079d1af80294593aee5f3b4646aa487a928e56 100644
--- a/src/assembler_ia32.h
+++ b/src/assembler_ia32.h
@@ -284,7 +284,9 @@ public:
 #endif // !NDEBUG
   }
 
-  ~Label() {
+  ~Label() {}
+
+  void FinalCheck() const {
     // Assert if label is being destroyed with unresolved branches pending.
     assert(!IsLinked());
     assert(!HasNear());
@@ -363,11 +365,16 @@ public:
     assert(!use_far_branches);
     (void)use_far_branches;
   }
-  ~AssemblerX86() {}
+  ~AssemblerX86() override;
 
   static const bool kNearJump = true;
   static const bool kFarJump = false;
 
+  Label *GetOrCreateCfgNodeLabel(SizeT NodeNumber);
+  void BindCfgNodeLabel(SizeT NodeNumber) override;
+  Label *GetOrCreateLocalLabel(SizeT Number);
+  void BindLocalLabel(SizeT Number);
+
   // Operations to emit GPR instructions (and dispatch on operand type).
   typedef void (AssemblerX86::*TypedEmitGPR)(Type, GPRRegister);
   typedef void (AssemblerX86::*TypedEmitAddr)(Type, const Address &);
@@ -848,6 +855,14 @@ private:
   void EmitGenericShift(int rm, Type Ty, const Operand &operand,
                         GPRRegister shifter);
 
+  typedef std::vector<Label *> LabelVector;
+  // A vector of pool-allocated x86 labels for CFG nodes.
+  LabelVector CfgNodeLabels;
+  // A vector of pool-allocated x86 labels for Local labels.
+  LabelVector LocalLabels;
+
+  Label *GetOrCreateLabel(SizeT Number, LabelVector &Labels);
+
   AssemblerBuffer buffer_;
 };