6869822: assert(Universe::narrow_oop_shift() == 0,"use unscaled narrow oop")
Summary: Replace the assert with narrow_oop_shift set to 0.
Reviewed-by: never, jcoomes
6862945: 4/3 conversion of jmethodID to methodOop in JVMTI is too expensive
Summary: Refactor JNIHandles::checked_resolve_jmethod_id() into fast and paranoid parts.
Reviewed-by: never, alanb