Add a getter for the address and size of the code range to the pulic API

src/heap/spaces.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_SPACES_H_
 #define V8_HEAP_SPACES_H_
 
 #include "src/allocation.h"
 #include "src/base/atomicops.h"
 #include "src/base/bits.h"
@@ skipping 862 matching lines @@
 
   // Frees the range of virtual memory, and frees the data structures used to
   // manage it.
   void TearDown();
 
   bool valid() { return code_range_ != NULL; }
   Address start() {
     DCHECK(valid());
     return static_cast<Address>(code_range_->address());
   }
+  size_t size() {
+    DCHECK(valid());
+    return code_range_->size();
+  }
   bool contains(Address address) {
     if (!valid()) 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 1986 matching lines @@
     count = 0;
   }
   // Must be small, since an iteration is used for lookup.
   static const int kMaxComments = 64;
 };
 #endif
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_SPACES_H_