RFR: 8184765: Dynamically resize SystemDictionary

[Gerard Ziemski]

hi all,

Please review this change that adds dynamic resizing of system dictionaries.

The biggest change is refactoring of the code that protects calculating of the table entry’s index using SystemDictionary_lock

A few notes:

- dynamic resizing is off when either dumping or using shared spaces
- we remove the experimental runtime option “PredictedLoadedClassCount” and add “DynamicallyResizeSystemDictionaries” to turn the resizing off (it’s on by default)
- the jtreg test uses stream of bytes to dynamically load numbered classes from memory instead of disk (thank you Ioi)

bug:    https://bugs.openjdk.java.net/browse/JDK-8184765
webrev: http://cr.openjdk.java.net/~gziemski/8184765_rev1


cheers