Request for reviews (XS): 7011386: race in objArrayKlass::array_klass_impl

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/7011386/webrev

Fixed 7011386: race in objArrayKlass::array_klass_impl

Other threads may access _lower_dimension field before
it is initialized by thread which holds the lock in
objArrayKlass::array_klass_impl().

Move _lower_dimension field initialization before
_higher_dimension.