[csa] Add ToLength and ToString variants with inlined fast checks

src/builtins/builtins-conversion-gen.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/builtins/builtins-utils-gen.h"
 #include "src/builtins/builtins.h"
 #include "src/code-factory.h"
 #include "src/code-stub-assembler.h"
 #include "src/objects-inl.h"
 
@@ skipping 115 matching lines @@
   Node* context = Parameter(Descriptor::kContext);
   Node* input = Parameter(Descriptor::kArgument);
 
   Return(ToNumber(context, input));
 }
 
 TF_BUILTIN(ToString, CodeStubAssembler) {
   Node* context = Parameter(Descriptor::kContext);
   Node* input = Parameter(Descriptor::kArgument);
 
-  Label is_number(this);
-  Label runtime(this);
-
-  GotoIf(TaggedIsSmi(input), &is_number);
-
-  Node* input_map = LoadMap(input);
-  Node* input_instance_type = LoadMapInstanceType(input_map);
-
-  Label not_string(this);
-  GotoIfNot(IsStringInstanceType(input_instance_type), &not_string);
-  Return(input);
-
-  Label not_heap_number(this);
-
-  BIND(&not_string);
-  { Branch(IsHeapNumberMap(input_map), &is_number, &not_heap_number); }
-
-  BIND(&is_number);
-  { Return(NumberToString(context, input)); }
-
-  BIND(&not_heap_number);
-  {
-    GotoIf(Word32NotEqual(input_instance_type, Int32Constant(ODDBALL_TYPE)),
-           &runtime);
-    Return(LoadObjectField(input, Oddball::kToStringOffset));
-  }
-
-  BIND(&runtime);
-  { Return(CallRuntime(Runtime::kToString, context, input)); }
+  Return(ToString(context, input));
 }
 
 // 7.1.1.1 OrdinaryToPrimitive ( O, hint )
 void ConversionBuiltinsAssembler::Generate_OrdinaryToPrimitive(
     Node* context, Node* input, OrdinaryToPrimitiveHint hint) {
   VARIABLE(var_result, MachineRepresentation::kTagged);
   Label return_result(this, &var_result);
 
   Handle<String> method_names[2];
   switch (hint) {
@@ skipping 215 matching lines @@
 
 // ES6 section 12.5.5 typeof operator
 TF_BUILTIN(Typeof, CodeStubAssembler) {
   Node* object = Parameter(TypeofDescriptor::kObject);
 
   Return(Typeof(object));
 }
 
 }  // namespace internal
 }  // namespace v8