[heap,cctest] Fix CodeRange tests that call AllocateRawMemory directly.

test/cctest/test-alloc.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 206 matching lines @@
     if (current_allocated < code_range_size / 10) {
       // Allocate a block.
       // Geometrically distributed sizes, greater than
       // Page::kMaxRegularHeapObjectSize (which is greater than code page area).
       // TODO(gc): instead of using 3 use some contant based on code_range_size
       // kMaxRegularHeapObjectSize.
       size_t requested =
           (Page::kMaxRegularHeapObjectSize << (Pseudorandom() % 3)) +
           Pseudorandom() % 5000 + 1;
       size_t allocated = 0;
-      Address base = code_range.AllocateRawMemory(requested,
-                                                  requested,
-                                                  &allocated);
+
+      // The request size has to be at least 2 code guard pages larger than the
+      // actual commit size.
+      Address base = code_range.AllocateRawMemory(
+          requested, requested - (2 * MemoryAllocator::CodePageGuardSize()),
+          &allocated);
       CHECK(base != NULL);
       blocks.Add(::Block(base, static_cast<int>(allocated)));
       current_allocated += static_cast<int>(allocated);
       total_allocated += static_cast<int>(allocated);
     } else {
       // Free a block.
       int index = Pseudorandom() % blocks.length();
       code_range.FreeRawMemory(blocks[index].base, blocks[index].size);
       current_allocated -= blocks[index].size;
       if (index < blocks.length() - 1) {
         blocks[index] = blocks.RemoveLast();
       } else {
         blocks.RemoveLast();
       }
     }
   }
 }