X64: Convert smis to holding 32 bits of payload.

test/cctest/test-api.cc

 // Copyright 2007-2009 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 1792 matching lines @@
   constraints.set_max_young_space_size(256 * K);
   constraints.set_max_old_space_size(2 * K * K);
   v8::SetResourceConstraints(&constraints);
 
   // Execute a script that causes out of memory.
   v8::V8::IgnoreOutOfMemoryException();
 
   // Build huge string. This should fail with out of memory exception.
   Local<Value> result = CompileRun(
     "var str = Array.prototype.join.call({length: 513}, \"A\").toUpperCase();"
-    "for (var i = 0; i < 21; i++) { str = str + str; }");
+    "for (var i = 0; i < 22; i++) { str = str + str; }");
 
   // Check for out of memory state.
   CHECK(result.IsEmpty());
   CHECK(context->HasOutOfMemoryException());
 }
 
 
 THREADED_TEST(ConstructCall) {
   v8::HandleScope scope;
   LocalContext context;
@@ skipping 6166 matching lines @@
     env->Global()->Set(v8_str("get_stack_limit"), fun);
     CompileRun("get_stack_limit();");
 
     CHECK(stack_limit == set_limit);
   }
   {
     v8::Locker locker;
     CHECK(stack_limit == set_limit);
   }
 }