remove this == null

test/cctest/test-spaces.cc

 // Copyright 2011 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 151 matching lines @@
                        ? MemoryAllocator::CodePageGuardStartOffset()
                        : MemoryChunk::kObjectStartOffset;
   size_t guard_size = (executable == EXECUTABLE)
                        ? MemoryAllocator::CodePageGuardSize()
                        : 0;
 
   MemoryChunk* memory_chunk = memory_allocator->AllocateChunk(reserve_area_size,
                                                               commit_area_size,
                                                               executable,
                                                               NULL);
-  size_t alignment = code_range->exists() ?
+  size_t alignment = code_range != NULL && code_range->valid() ?
                      MemoryChunk::kAlignment : OS::CommitPageSize();
   size_t reserved_size = ((executable == EXECUTABLE))
       ? RoundUp(header_size + guard_size + reserve_area_size + guard_size,
                 alignment)
       : RoundUp(header_size + reserve_area_size, OS::CommitPageSize());
   CHECK(memory_chunk->size() == reserved_size);
   CHECK(memory_chunk->area_start() < memory_chunk->address() +
                                      memory_chunk->size());
   CHECK(memory_chunk->area_end() <= memory_chunk->address() +
                                     memory_chunk->size());
@@ skipping 235 matching lines @@
   CompileRun("/*empty*/");
   for (int i = FIRST_PAGED_SPACE; i <= LAST_PAGED_SPACE; i++) {
     // Debug code can be very large, so skip CODE_SPACE if we are generating it.
     if (i == CODE_SPACE && i::FLAG_debug_code) continue;
     CHECK_EQ(1, isolate->heap()->paged_space(i)->CountTotalPages());
   }
 
   // No large objects required to perform the above steps.
   CHECK(isolate->heap()->lo_space()->IsEmpty());
 }