Turn StringLengthStub (used by string wrappers only) into a hydrogen stub.

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index c383ca07e61e1d07061950c6df882a549b4b8d8d..4ff8a6817a502a3b160b3d51171cd536f4ea52fd 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -170,6 +170,26 @@ void KeyedLoadFieldStub::InitializeInterfaceDescriptor(
 }
 
 
+void StringLengthStub::InitializeInterfaceDescriptor(
+    Isolate* isolate,
+    CodeStubInterfaceDescriptor* descriptor) {
+  static Register registers[] = { edx, ecx };
+  descriptor->register_param_count_ = 2;
+  descriptor->register_params_ = registers;
+  descriptor->deoptimization_handler_ = NULL;
+}
+
+
+void KeyedStringLengthStub::InitializeInterfaceDescriptor(
+    Isolate* isolate,
+    CodeStubInterfaceDescriptor* descriptor) {
+  static Register registers[] = { edx, ecx };
+  descriptor->register_param_count_ = 2;
+  descriptor->register_params_ = registers;
+  descriptor->deoptimization_handler_ = NULL;
+}
+
+
 void KeyedStoreFastElementStub::InitializeInterfaceDescriptor(
     Isolate* isolate,
     CodeStubInterfaceDescriptor* descriptor) {
@@ -1046,26 +1066,6 @@ void FunctionPrototypeStub::Generate(MacroAssembler* masm) {
 }
 
 
-void StringLengthStub::Generate(MacroAssembler* masm) {
-  // ----------- S t a t e -------------
-  //  -- ecx    : name
-  //  -- edx    : receiver
-  //  -- esp[0] : return address
-  // -----------------------------------
-  Label miss;
-
-  if (kind() == Code::KEYED_LOAD_IC) {
-    __ cmp(ecx, Immediate(masm->isolate()->factory()->length_string()));
-    __ j(not_equal, &miss);
-  }
-
-  StubCompiler::GenerateLoadStringLength(masm, edx, eax, ebx, &miss);
-  __ bind(&miss);
-  StubCompiler::TailCallBuiltin(
-      masm, BaseLoadStoreStubCompiler::MissBuiltin(kind()));
-}
-
-
 void StoreArrayLengthStub::Generate(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- eax    : value