RFR: JDK-8132994 - /modules and /packages should not be parsed by the jimage parser

[Jim Laskey (Oracle)]

Changed to special case parse /modules/ and /packages/.  Will actually reduce string table size slightly (better common string match.)

http://cr.openjdk.java.net/~jlaskey/8132994/webrev/index.html <http://cr.openjdk.java.net/~jlaskey/8132994/webrev/index.html>
https://bugs.openjdk.java.net/browse/JDK-8132994 <https://bugs.openjdk.java.net/browse/JDK-8132994>