[WIP] EqualStub and NotEqualStub.

src/compiler/code-stub-assembler.h

Index: src/compiler/code-stub-assembler.h
diff --git a/src/compiler/code-stub-assembler.h b/src/compiler/code-stub-assembler.h
index 48539d8ac5840f0abb5765b1d168e5366cae6741..da48b35cecfda58a9086d665e95a135829c3f025 100644
--- a/src/compiler/code-stub-assembler.h
+++ b/src/compiler/code-stub-assembler.h
@@ -141,6 +141,7 @@ class CodeStubAssembler {
   Node* BooleanConstant(bool value);
   Node* ExternalConstant(ExternalReference address);
   Node* Float64Constant(double value);
+  Node* BooleanMapConstant();
   Node* HeapNumberMapConstant();
 
   Node* Parameter(int value);
@@ -267,6 +268,8 @@ class CodeStubAssembler {
   Node* LoadObjectField(Node* object, int offset);
   // Load the floating point value of a HeapNumber.
   Node* LoadHeapNumberValue(Node* object);
+  // Load the bit field of a Map.
+  Node* LoadMapBitField(Node* map);
   // Load the instance type of a Map.
   Node* LoadMapInstanceType(Node* map);
 
@@ -309,6 +312,7 @@ class CodeStubAssembler {
   void BranchIfFloat64IsNaN(Node* value, Label* if_true, Label* if_false) {
     BranchIfFloat64Equal(value, value, if_false, if_true);
   }
+  void BranchIfWord32Equal(Node* a, Node* b, Label* if_true, Label* if_false);
 
   // Helpers which delegate to RawMachineAssembler.
   Factory* factory() const;