No access check support.

This CL adds support to disable access check when a method is preverified (at
compilation time) and we know we don't need to do any access check.

The interpreter has now two modes of execution: with or without access check.
This is realized by using a template function.

A new runtime access flag kAccPreverified is added onto each method belonging
to a preverified class. If this flag is set, we enter the interpreter in "no
access check" mode. Otherwise, we enter the interpreter in "with access check"
mode.

Change-Id: Ic34163421d5b0aca3d1bce22ef7c095dcf465a18