MIPS: Make object accessors more const-correct.

src/objects-inl.h

 // Copyright 2012 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.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 1157 matching lines @@
   #define READ_DOUBLE_FIELD(p, offset) \
     (*reinterpret_cast<const double*>(FIELD_ADDR_CONST(p, offset)))
 #else  // V8_TARGET_ARCH_MIPS
   // Prevent gcc from using load-double (mips ldc1) on (possibly)
   // non-64-bit aligned HeapNumber::value.
   static inline double read_double_field(const void* p, int offset) {
     union conversion {
       double d;
       uint32_t u[2];
     } c;
-    c.u[0] = (*reinterpret_cast<uint32_t*>(FIELD_ADDR_CONST(p, offset)));
-    c.u[1] = (*reinterpret_cast<uint32_t*>(FIELD_ADDR_CONST(p, offset + 4)));
+    c.u[0] = (*reinterpret_cast<const uint32_t*>(
+        FIELD_ADDR_CONST(p, offset)));
+    c.u[1] = (*reinterpret_cast<const uint32_t*>(
+        FIELD_ADDR_CONST(p, offset + 4)));
     return c.d;
   }
   #define READ_DOUBLE_FIELD(p, offset) read_double_field(p, offset)
 #endif  // V8_TARGET_ARCH_MIPS
 
 #ifndef V8_TARGET_ARCH_MIPS
   #define WRITE_DOUBLE_FIELD(p, offset, value) \
     (*reinterpret_cast<double*>(FIELD_ADDR(p, offset)) = value)
 #else  // V8_TARGET_ARCH_MIPS
   // Prevent gcc from using store-double (mips sdc1) on (possibly)
@@ skipping 5803 matching lines @@
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_