[runtime] Replace %to_string_fun with %_ToString.

src/runtime.js

Index: src/runtime.js
diff --git a/src/runtime.js b/src/runtime.js
index e2eec4f17e9c61594c236846691d3047800657c6..f0bc13340b62f3050443afdc3e56e810d77b6637 100644
--- a/src/runtime.js
+++ b/src/runtime.js
@@ -14,14 +14,12 @@
 var $defaultString;
 var $NaN;
 var $nonNumberToNumber;
-var $nonStringToString;
 var $sameValue;
 var $sameValueZero;
 var $toInteger;
 var $toLength;
 var $toNumber;
 var $toPositiveInteger;
-var $toString;
 
 var harmony_tolength = false;
 
@@ -47,8 +45,7 @@ function APPLY_PREPARE(args) {
 
   // First check that the receiver is callable.
   if (!IS_CALLABLE(this)) {
-    throw %make_type_error(kApplyNonFunction, %to_string_fun(this),
-                           typeof this);
+    throw %make_type_error(kApplyNonFunction, TO_STRING(this), typeof this);
   }
 
   // First check whether length is a positive Smi and args is an
@@ -84,8 +81,7 @@ function REFLECT_APPLY_PREPARE(args) {
 
   // First check that the receiver is callable.
   if (!IS_CALLABLE(this)) {
-    throw %make_type_error(kApplyNonFunction, %to_string_fun(this),
-                           typeof this);
+    throw %make_type_error(kApplyNonFunction, TO_STRING(this), typeof this);
   }
 
   // First check whether length is a positive Smi and args is an
@@ -134,17 +130,17 @@ function REFLECT_CONSTRUCT_PREPARE(
 
   if (!ctorOk) {
     if (!IS_CALLABLE(this)) {
-      throw %make_type_error(kCalledNonCallable, %to_string_fun(this));
+      throw %make_type_error(kCalledNonCallable, TO_STRING(this));
     } else {
-      throw %make_type_error(kNotConstructor, %to_string_fun(this));
+      throw %make_type_error(kNotConstructor, TO_STRING(this));
     }
   }
 
   if (!newTargetOk) {
     if (!IS_CALLABLE(newTarget)) {
-      throw %make_type_error(kCalledNonCallable, %to_string_fun(newTarget));
+      throw %make_type_error(kCalledNonCallable, TO_STRING(newTarget));
     } else {
-      throw %make_type_error(kNotConstructor, %to_string_fun(newTarget));
+      throw %make_type_error(kNotConstructor, TO_STRING(newTarget));
     }
   }
 
@@ -220,14 +216,6 @@ function ToString(x) {
   return (IS_NULL(x)) ? 'null' : ToString(DefaultString(x));
 }
 
-function NonStringToString(x) {
-  if (IS_NUMBER(x)) return %_NumberToString(x);
-  if (IS_BOOLEAN(x)) return x ? 'true' : 'false';
-  if (IS_UNDEFINED(x)) return 'undefined';
-  // Types that can't be converted to string are caught in DefaultString.
-  return (IS_NULL(x)) ? 'null' : ToString(DefaultString(x));
-}
-
 
 // ECMA-262, section 9.4, page 34.
 function ToInteger(x) {
@@ -360,14 +348,12 @@ function ToPositiveInteger(x, rangeErrorIndex) {
 $defaultString = DefaultString;
 $NaN = %GetRootNaN();
 $nonNumberToNumber = NonNumberToNumber;
-$nonStringToString = NonStringToString;
 $sameValue = SameValue;
 $sameValueZero = SameValueZero;
 $toInteger = ToInteger;
 $toLength = ToLength;
 $toNumber = ToNumber;
 $toPositiveInteger = ToPositiveInteger;
-$toString = ToString;
 
 %InstallToContext([
   "apply_prepare_builtin", APPLY_PREPARE,
@@ -379,11 +365,9 @@ $toString = ToString;
 %InstallToContext([
   "concat_iterable_to_array", ConcatIterableToArray,
   "non_number_to_number", NonNumberToNumber,
-  "non_string_to_string", NonStringToString,
   "to_integer_fun", ToInteger,
   "to_length_fun", ToLength,
   "to_number_fun", ToNumber,
-  "to_string_fun", ToString,
 ]);
 
 utils.Export(function(to) {