8171294: Slow compilation with long classpaths under JDK 9 Summary: Precompute packages contained in jars, to quickly determine at the lookup time whether a jar contains the given package Reviewed-by: jjg Contributed-by: maurizio.cimadamore@oracle.com

^build/
^dist/
^drop/
^drop_included/
^webrev
/nbproject/private/