Add an IC for CompareNil operations

src/code-stubs-hydrogen.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 491 matching lines @@
   AddInstruction(deopt);
   current_block()->MarkAsDeoptimizing();
   return GetParameter(0);
 }
 
 
 Handle<Code> ArrayNArgumentsConstructorStub::GenerateCode() {
   return DoGenerateCode(this);
 }
 
+
+template <>
+HValue* CodeStubGraphBuilder<CompareNilICStub>::BuildCodeUninitializedStub() {
+  CompareNilICStub* stub = casted_stub();
+  HIfContinuation continuation;
+  Handle<Map> sentinel_map(graph()->isolate()->heap()->meta_map());
+  BuildCompareNil(GetParameter(2), stub->Kind(),
+                  stub->GetTypes(), sentinel_map,
+                  RelocInfo::kNoPosition, &continuation);
+  IfBuilder if_nil(this, &continuation);
+  if_nil.Then();
+  if (continuation.IsTrueReachable()) {
+    environment()->Push(graph()->GetConstantSmi1());
+  }
+  if (continuation.IsFalseReachable()) {
+    if_nil.Else();
+    environment()->Push(graph()->GetConstantSmi0());
+  }
+  if_nil.End();
+  return environment()->Pop();
+}
+
+
+Handle<Code> CompareNilICStub::GenerateCode() {
+  return DoGenerateCode(this);
+}
+
 } }  // namespace v8::internal