unstarted_runtime: Add additional cutouts

These allow us to initialize a further 90 classes. getIntVolatile
was used by the static initializer for ThreadLocal, which is used
quite frequently. This class was compile time initializable for M.

java.lang.System.getSecurityManager : 5 classes
sun.misc.Unsafe.getIntVolatile : 85 classes

bug: 27265238

(cherry picked from commit 34a316fa)

Change-Id: I85aa52cc9a67123e2ac2feec48a96eb795427adf