X64: Enable specialized stubs for length property.

src/x64/ic-x64.cc

Index: src/x64/ic-x64.cc
===================================================================
--- src/x64/ic-x64.cc	(revision 2618)
+++ src/x64/ic-x64.cc	(working copy)
@@ -606,9 +606,22 @@
 
 
 void LoadIC::GenerateArrayLength(MacroAssembler* masm) {
-  Generate(masm, ExternalReference(IC_Utility(kLoadIC_Miss)));
+  // ----------- S t a t e -------------
+  //  -- rcx    : name
+  //  -- rsp[0] : return address
+  //  -- rsp[8] : receiver
+  // -----------------------------------
+
+  Label miss;
+
+  __ movq(rax, Operand(rsp, kPointerSize));
+
+  StubCompiler::GenerateLoadArrayLength(masm, rax, rdx, &miss);
+  __ bind(&miss);
+  StubCompiler::GenerateLoadMiss(masm, Code::LOAD_IC);
 }
 
+
 void LoadIC::GenerateFunctionPrototype(MacroAssembler* masm) {
   Generate(masm, ExternalReference(IC_Utility(kLoadIC_Miss)));
 }
@@ -650,10 +663,23 @@
 
 
 void LoadIC::GenerateStringLength(MacroAssembler* masm) {
-  Generate(masm, ExternalReference(IC_Utility(kLoadIC_Miss)));
+  // ----------- S t a t e -------------
+  //  -- rcx    : name
+  //  -- rsp[0] : return address
+  //  -- rsp[8] : receiver
+  // -----------------------------------
+
+  Label miss;
+
+  __ movq(rax, Operand(rsp, kPointerSize));
+
+  StubCompiler::GenerateLoadStringLength(masm, rax, rdx, &miss);
+  __ bind(&miss);
+  StubCompiler::GenerateLoadMiss(masm, Code::LOAD_IC);
 }
 
 
+
 bool LoadIC::PatchInlinedLoad(Address address, Object* map, int offset) {
   // The address of the instruction following the call.
   Address test_instruction_address =