RFR (L) 8194812: Extend class-data sharing to support the module path

[Calvin Cheung]

JBS: https://bugs.openjdk.java.net/browse/JDK-8194812

webrev: http://cr.openjdk.java.net/~ccheung/8194812/webrev.00/

Design write-up: 
http://cr.openjdk.java.net/~ccheung/8194812/write-up/module-path-design.pdf

Testing: hs-tier1 through hs-tier4 (in progress, no new failures so far).

thanks,
Calvin