MIPS64: Implement intrinsics from sun.misc.Unsafe:

- int getInt(Object, long)
- int getIntVolatile(Object, long)
- long getLong(Object, long)
- long getLongVolatile(Object, long)
- Object getObject(Object, long)
- Object getObjectVolatile(Object, long)
- void putInt(Object, long, int)
- void putOrderedInt(Object, long, int)
- void putIntVolatile(Object, long, int)
- void putObject(Object, long, Object)
- void putOrderedObject(Object, long, Object)
- void putObjectVolatile(Object, long, Object)
- void putLong(Object, long, long)
- void putOrderedLong(Object, long, long)
- void putLongVolatile(Object, long, long)

The compareAndSwap*() functions will be delivered in a separate patch.

Change-Id: I94238254b2f9df017d58fa9a4bb38632f6479472