RFR: 8148397: Create new tests for IHOP

[Michail Chernov]

Hi,

Could I have a review for this change, please:

Bug: https://bugs.openjdk.java.net/browse/JDK-8148397
Webrev: http://cr.openjdk.java.net/~mchernov/8148397/webrev.00/

TestIHOPParallel.java - stress test for Adaptive IHOP with logging. Test 
allocates and frees memory in several threads. Executes with enabled 
logging for IHOP: -Xlog:gc+ihop=debug,gc+ihop+ergo=debug,gc+ergo=debug . 
Expects for no crashes during working.

TestIHOPStatic.java - provokes concurrent cycle initiation with static 
IHOP during allocation to check that occupancy and threshold (IHOP) are 
valid and occupancy is greater than threshold.

TestIHOPErgo.java - provokes concurrent cycle initiation with static and 
adaptive IHOP. Checks that occupancy and threshold are valid. Checks 
that adaptive IHOP prediction is activated during some iterations.

Executed on several configurations with nightly VM options.

Thanks
Michail




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