Revert "Revert "Add JIT""

Added missing EntryPointToCodePointer.

This reverts commit a5ca888d715cd0c6c421313211caa1928be3e399.

Change-Id: Ia74df0ef3a7babbdcb0466fd24da28e304e3f5af
diff --git a/runtime/oat_file.h b/runtime/oat_file.h
index 6ae3c3e..5e68439 100644
--- a/runtime/oat_file.h
+++ b/runtime/oat_file.h
@@ -147,8 +147,8 @@
       return reinterpret_cast<T>(begin_ + offset);
     }
 
-    const uint8_t* const begin_;
-    const uint32_t code_offset_;
+    const uint8_t* begin_;
+    uint32_t code_offset_;
 
     friend class OatClass;
   };