Revert r13901 to reland with proper credit to external contributor.

src/spaces.h

 // 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 876 matching lines @@
   // Reserves a range of virtual memory, but does not commit any of it.
   // Can only be called once, at heap initialization time.
   // Returns false on failure.
   bool SetUp(const size_t requested_size);
 
   // Frees the range of virtual memory, and frees the data structures used to
   // manage it.
   void TearDown();
 
   bool exists() { return this != NULL && code_range_ != NULL; }
-  Address start() {
-    if (this == NULL || code_range_ == NULL) return NULL;
-    return static_cast<Address>(code_range_->address());
-  }
   bool contains(Address address) {
     if (this == NULL || code_range_ == NULL) return false;
     Address start = static_cast<Address>(code_range_->address());
     return start <= address && address < start + code_range_->size();
   }
 
   // Allocates a chunk of memory from the large-object portion of
   // the code range.  On platforms with no separate code range, should
   // not be called.
   MUST_USE_RESULT Address AllocateRawMemory(const size_t requested_size,
@@ skipping 1916 matching lines @@
   }
   // Must be small, since an iteration is used for lookup.
   static const int kMaxComments = 64;
 };
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SPACES_H_