PPC: fix allocation issues for PPC64.

test/cctest/test-strings.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 1191 matching lines @@
   CHECK(string->IsSlicedString());
   CHECK(SlicedString::cast(*string)->parent()->IsSeqString());
   CHECK_EQ(0, strcmp("cdefghijklmnopqrstuvwx", string->ToCString().get()));
 }
 
 
 UNINITIALIZED_TEST(OneByteArrayJoin) {
   v8::Isolate::CreateParams create_params;
   // Set heap limits.
   create_params.constraints.set_max_semi_space_size(1);
-  create_params.constraints.set_max_old_space_size(5);
+  create_params.constraints.set_max_old_space_size(6);
   v8::Isolate* isolate = v8::Isolate::New(create_params);
   isolate->Enter();
 
   {
     // String s is made of 2^17 = 131072 'c' characters and a is an array
     // starting with 'bad', followed by 2^14 times the string s. That means the
     // total length of the concatenated strings is 2^31 + 3. So on 32bit systems
     // summing the lengths of the strings (as Smis) overflows and wraps.
     LocalContext context(isolate);
     v8::HandleScope scope(isolate);
@@ skipping 229 matching lines @@
     CHECK(isolate->has_pending_exception());                                   \
     isolate->clear_pending_exception();                                        \
     dummy.Dispose();                                                           \
   }
 
 INVALID_STRING_TEST(NewStringFromAscii, char)
 INVALID_STRING_TEST(NewStringFromUtf8, char)
 INVALID_STRING_TEST(NewStringFromOneByte, uint8_t)
 
 #undef INVALID_STRING_TEST