Uniformly handle 'undefined' store to Float64Array and Float32Array.

test/cctest/test-api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 12884 matching lines @@
                   kElementCount);
   result = CompileRun(test_buf.start());
   CHECK_EQ(false, result->BooleanValue());
 
   // Check other boundary conditions, values and operations.
   result = CompileRun("for (var i = 0; i < 8; i++) {"
                       "  ext_array[7] = undefined;"
                       "}"
                       "ext_array[7];");
   CHECK_EQ(0, result->Int32Value());
-  CHECK_EQ(
-      0, static_cast<int>(jsobj->GetElement(7)->ToObjectChecked()->Number()));
+  if (array_type == kExternalDoubleArray ||
+      array_type == kExternalFloatArray) {
+    CHECK_EQ(
+        static_cast<int>(0x80000000),
+        static_cast<int>(jsobj->GetElement(7)->ToObjectChecked()->Number()));
+  } else {
+    CHECK_EQ(0, static_cast<int>(
+        jsobj->GetElement(7)->ToObjectChecked()->Number()));
+  }
 
   result = CompileRun("for (var i = 0; i < 8; i++) {"
                       "  ext_array[6] = '2.3';"
                       "}"
                       "ext_array[6];");
   CHECK_EQ(2, result->Int32Value());
   CHECK_EQ(
       2, static_cast<int>(jsobj->GetElement(6)->ToObjectChecked()->Number()));
 
   if (array_type != v8::kExternalFloatArray &&
@@ skipping 3159 matching lines @@
   CompileRun("throw 'exception';");
 }
 
 
 TEST(CallCompletedCallbackTwoExceptions) {
   v8::HandleScope scope;
   LocalContext env;
   v8::V8::AddCallCompletedCallback(CallCompletedCallbackException);
   CompileRun("throw 'first exception';");
 }