Request for Reviews (S): 8008180: Several tests in compiler/5091921 need more time to run

[David Chase]

Changes: http://cr.openjdk.java.net/~drchase/8008180/webrev.00/

Bug: Four tests in the 5091921 set of tests require more time to run on some testing machines.

Fix: Added an explicit timeout, doubling on a test-by-test basis until they pass at least once.
(two tests get 240s, two get 480s, meaning that they require at least 50% of that time)

Testing: Jtreg locally, then JPRT, on the modified set of tests, run on three different test queues looking for timeouts.