Fix Array.length, String.length and Function.prototype LoadICs on x64.

src/x64/code-stubs-x64.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 2371 matching lines @@
 void ArrayLengthStub::Generate(MacroAssembler* masm) {
   Label miss;
   Register receiver;
   if (kind() == Code::KEYED_LOAD_IC) {
     // ----------- S t a t e -------------
     //  -- rax    : key
     //  -- rdx    : receiver
     //  -- rsp[0] : return address
     // -----------------------------------
     __ Cmp(rax, masm->isolate()->factory()->length_string());
+    __ j(not_equal, &miss);
     receiver = rdx;
   } else {
     ASSERT(kind() == Code::LOAD_IC);
     // ----------- S t a t e -------------
     //  -- rax    : receiver
     //  -- rcx    : name
     //  -- rsp[0] : return address
     // -----------------------------------
     receiver = rax;
   }
 
   StubCompiler::GenerateLoadArrayLength(masm, receiver, r8, &miss);
   __ bind(&miss);
   StubCompiler::GenerateLoadMiss(masm, kind());
 }
 
 
 void FunctionPrototypeStub::Generate(MacroAssembler* masm) {
   Label miss;
   Register receiver;
   if (kind() == Code::KEYED_LOAD_IC) {
     // ----------- S t a t e -------------
     //  -- rax    : key
     //  -- rdx    : receiver
     //  -- rsp[0] : return address
     // -----------------------------------
     __ Cmp(rax, masm->isolate()->factory()->prototype_string());
+    __ j(not_equal, &miss);
     receiver = rdx;
   } else {
     ASSERT(kind() == Code::LOAD_IC);
     // ----------- S t a t e -------------
     //  -- rax    : receiver
     //  -- rcx    : name
     //  -- rsp[0] : return address
     // -----------------------------------
     receiver = rax;
   }
 
   StubCompiler::GenerateLoadFunctionPrototype(masm, receiver, r8, r9, &miss);
   __ bind(&miss);
   StubCompiler::GenerateLoadMiss(masm, kind());
 }
 
 
 void StringLengthStub::Generate(MacroAssembler* masm) {
   Label miss;
   Register receiver;
   if (kind() == Code::KEYED_LOAD_IC) {
     // ----------- S t a t e -------------
     //  -- rax    : key
     //  -- rdx    : receiver
     //  -- rsp[0] : return address
     // -----------------------------------
     __ Cmp(rax, masm->isolate()->factory()->length_string());
+    __ j(not_equal, &miss);
     receiver = rdx;
   } else {
     ASSERT(kind() == Code::LOAD_IC);
     // ----------- S t a t e -------------
     //  -- rax    : receiver
     //  -- rcx    : name
     //  -- rsp[0] : return address
     // -----------------------------------
     receiver = rax;
   }
@@ skipping 4426 matching lines @@
 #endif
 
   __ Ret();
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64