Move even more clinit code to reg functions

This changes moves clinit code that was blocked
by failure of art test 119-noimage-patchoat.
This was solved by calling EnsureInitialized
on java.lang.reflect.Field class before
libcore JNI_OnLoad is called.

This changes allows 2 more classes to be
compile-time initialized.

Bug: 28153851
Change-Id: I1308efa28ce08bbfba5da5567dcd0b0a75b1e066