Replace ICStub for array.length with hydrogen stub

src/stub-cache.h

Index: src/stub-cache.h
diff --git a/src/stub-cache.h b/src/stub-cache.h
index 56e3d4ff743de3d6ef8cc165daed661fbce1c73f..ef2d16f47ea1b2b1140b3ca8f2371817fb8d93d7 100644
--- a/src/stub-cache.h
+++ b/src/stub-cache.h
@@ -126,6 +126,10 @@ class StubCache {
   Handle<Code> ComputeLoadNormal(Handle<Name> name,
                                  Handle<JSObject> object);
 
+  Handle<Code> ComputeLoadArrayLength(Handle<Name> name,
+                                      Handle<JSObject> object,
+                                      Handle<JSObject> holder);
+
   Handle<Code> ComputeLoadGlobal(Handle<Name> name,
                                  Handle<JSObject> object,
                                  Handle<GlobalObject> holder,
@@ -600,6 +604,10 @@ class BaseLoadStubCompiler: public StubCompiler {
                                 Handle<Name> name,
                                 PropertyIndex index);
 
+  Handle<Code> CompileArrayLength(Handle<JSObject> object,
+                                  Handle<JSObject> holder,
+                                  Handle<Name> name);
+
   Handle<Code> CompileLoadCallback(Handle<JSObject> object,
                                    Handle<JSObject> holder,
                                    Handle<Name> name,
@@ -717,6 +725,8 @@ class LoadStubCompiler: public BaseLoadStubCompiler {
 
   static Register receiver() { return registers()[0]; }
 
+  static Register name() { return registers()[1]; }
+
  private:
   static Register* registers();
   virtual Code::Kind kind() { return Code::LOAD_IC; }