[builtins] Get rid of a few %_ClassOf uses.

With subclassing and @@toStringTag, %_ClassOf is not necessarily what
you want for ES6 anymore, so better avoid relying on %_ClassOf in our
builtins.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1439003002

Cr-Commit-Position: refs/heads/master@{#31953}

src/js/harmony-atomics.js

@@ -32,7 +32,7 @@ function CheckSharedIntegerTypedArray(ia) {
 
 function CheckSharedInteger32TypedArray(ia) {
   CheckSharedIntegerTypedArray(ia);
-  if (%_ClassOf(ia) !== 'Int32Array') {
+  if (!%IsSharedInteger32TypedArray(ia)) {
     throw MakeTypeError(kNotInt32SharedTypedArray, ia);
   }
 }

src/js/harmony-simd.js

@@ -62,11 +62,11 @@ function NAMECheckJS(a) {
 }
 
 function NAMEToString() {
-  if (typeof(this) !== 'TYPE' && %_ClassOf(this) !== 'NAME') {
+  var value = %_ValueOf(this);
+  if (typeof(value) !== 'TYPE') {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         "NAME.prototype.toString", this);
   }
-  var value = %_ValueOf(this);
   var str = "SIMD.NAME(";
   str += %NAMEExtractLane(value, 0);
   for (var i = 1; i < LANES; i++) {
@@ -76,11 +76,11 @@ function NAMEToString() {
 }
 
 function NAMEToLocaleString() {
-  if (typeof(this) !== 'TYPE' && %_ClassOf(this) !== 'NAME') {
+  var value = %_ValueOf(this);
+  if (typeof(value) !== 'TYPE') {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         "NAME.prototype.toLocaleString", this);
   }
-  var value = %_ValueOf(this);
   var str = "SIMD.NAME(";
   str += %NAMEExtractLane(value, 0).toLocaleString();
   for (var i = 1; i < LANES; i++) {
@@ -90,11 +90,12 @@ function NAMEToLocaleString() {
 }
 
 function NAMEValueOf() {
-  if (typeof(this) !== 'TYPE' && %_ClassOf(this) !== 'NAME') {
+  var value = %_ValueOf(this);
+  if (typeof(value) !== 'TYPE') {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         "NAME.prototype.valueOf", this);
   }
-  return %_ValueOf(this);
+  return value;
 }
 
 function NAMEExtractLaneJS(instance, lane) {

src/js/macros.py

@@ -111,7 +111,6 @@ macro IS_SYMBOL_WRAPPER(arg)    = (%_ClassOf(arg) === 'Symbol');
 macro IS_BOOLEAN_WRAPPER(arg)   = (%_ClassOf(arg) === 'Boolean');
 macro IS_ERROR(arg)             = (%_ClassOf(arg) === 'Error');
 macro IS_SCRIPT(arg)            = (%_ClassOf(arg) === 'Script');
-macro IS_ARGUMENTS(arg)         = (%_ClassOf(arg) === 'Arguments');
 macro IS_GLOBAL(arg)            = (%_ClassOf(arg) === 'global');
 macro IS_ARRAYBUFFER(arg)       = (%_ClassOf(arg) === 'ArrayBuffer');
 macro IS_DATAVIEW(arg)          = (%_ClassOf(arg) === 'DataView');

src/runtime/runtime-typedarray.cc

@@ -433,6 +433,19 @@ RUNTIME_FUNCTION(Runtime_IsSharedIntegerTypedArray) {
 }
 
 
+RUNTIME_FUNCTION(Runtime_IsSharedInteger32TypedArray) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  if (!args[0]->IsJSTypedArray()) {
+    return isolate->heap()->false_value();
+  }
+
+  Handle<JSTypedArray> obj(JSTypedArray::cast(args[0]));
+  return isolate->heap()->ToBoolean(obj->GetBuffer()->is_shared() &&
+                                    obj->type() == kExternalInt32Array);
+}
+
+
 RUNTIME_FUNCTION(Runtime_DataViewInitialize) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 4);

src/runtime/runtime.h

@@ -1008,6 +1008,7 @@ namespace internal {
   F(IsTypedArray, 1, 1)                      \
   F(IsSharedTypedArray, 1, 1)                \
   F(IsSharedIntegerTypedArray, 1, 1)         \
+  F(IsSharedInteger32TypedArray, 1, 1)       \
   F(DataViewInitialize, 4, 1)                \
   F(DataViewGetUint8, 3, 1)                  \
   F(DataViewGetInt8, 3, 1)                   \