RFR(M) : 8010124 : JVM_GetClassContext: use GrowableArray instead of KlassLink

[David Chase]

This is an update and application of a leftover patch from Christian Thalinger's bug 7198429 .
I believe it is intended to accumulate call stacks slightly more quickly; it is not a correctness bug.

There were some minor differences and some parts had already been applied, so it required a hand-apply and line-by-line inspection.

http://cr.openjdk.java.net/~drchase/8010124/webrev.00/

Testing: jtreg locally, JPRT, also hand-tested some applets that attempt to do Bad Things, and they failed.

David