[builtins] Properly optimize TypedArray/DataView accessors.

src/objects.cc

 // Copyright 2015 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/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <sstream>
 
@@ skipping 10218 matching lines @@
   if (description->IsUndefined(isolate)) {
     return isolate->factory()->empty_string();
   }
   IncrementalStringBuilder builder(isolate);
   builder.AppendCharacter('[');
   builder.AppendString(Handle<String>::cast(description));
   builder.AppendCharacter(']');
   return builder.Finish();
 }
 
+// static
+MaybeHandle<String> Name::ToFunctionName(Handle<Name> name,
+                                         Handle<String> prefix) {
+  Handle<String> name_string;
+  Isolate* const isolate = name->GetIsolate();
+  ASSIGN_RETURN_ON_EXCEPTION(isolate, name_string, ToFunctionName(name),
+                             String);
+  IncrementalStringBuilder builder(isolate);
+  builder.AppendString(prefix);
+  builder.AppendCharacter(' ');
+  builder.AppendString(name_string);
+  return builder.Finish();
+}
 
 namespace {
 
 bool AreDigits(const uint8_t* s, int from, int to) {
   for (int i = from; i < to; i++) {
     if (s[i] < '0' || s[i] > '9') return false;
   }
 
   return true;
 }
@@ skipping 8525 matching lines @@
   if (cell->value() != *new_value) {
     cell->set_value(*new_value);
     Isolate* isolate = cell->GetIsolate();
     cell->dependent_code()->DeoptimizeDependentCodeGroup(
         isolate, DependentCode::kPropertyCellChangedGroup);
   }
 }
 
 }  // namespace internal
 }  // namespace v8