Flatten the string in StringToDouble function.

src/runtime/runtime-numbers.cc

 // Copyright 2014 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/v8.h"
 
 #include "src/arguments.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 175 matching lines @@
 
   // Slower case.
   int flags = ALLOW_HEX;
   if (FLAG_harmony_numeric_literals) {
     // The current spec draft has not updated "ToNumber Applied to the String
     // Type", https://bugs.ecmascript.org/show_bug.cgi?id=1584
     flags |= ALLOW_OCTAL | ALLOW_BINARY;
   }
 
   return *isolate->factory()->NewNumber(
-      StringToDouble(isolate->unicode_cache(), *subject, flags));
+      StringToDouble(isolate->unicode_cache(), subject, flags));
 }
 
 
 RUNTIME_FUNCTION(Runtime_StringParseInt) {
   HandleScope handle_scope(isolate);
   DCHECK(args.length() == 2);
   CONVERT_ARG_HANDLE_CHECKED(String, subject, 0);
   CONVERT_NUMBER_CHECKED(int, radix, Int32, args[1]);
   RUNTIME_ASSERT(radix == 0 || (2 <= radix && radix <= 36));
 
@@ skipping 15 matching lines @@
 
   return *isolate->factory()->NewNumber(value);
 }
 
 
 RUNTIME_FUNCTION(Runtime_StringParseFloat) {
   HandleScope shs(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(String, subject, 0);
 
-  subject = String::Flatten(subject);
-  double value = StringToDouble(isolate->unicode_cache(), *subject,
+  double value = StringToDouble(isolate->unicode_cache(), subject,
                                 ALLOW_TRAILING_JUNK, base::OS::nan_value());
 
   return *isolate->factory()->NewNumber(value);
 }
 
 
 RUNTIME_FUNCTION(Runtime_NumberToStringRT) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_NUMBER_ARG_HANDLE_CHECKED(number, 0);
@@ skipping 344 matching lines @@
 
 RUNTIME_FUNCTION(RuntimeReference_IsNonNegativeSmi) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_CHECKED(Object, obj, 0);
   return isolate->heap()->ToBoolean(obj->IsSmi() &&
                                     Smi::cast(obj)->value() >= 0);
 }
 }
 }  // namespace v8::internal