[9] RFR(S): 8021775: compiler/8009761/Test8009761.java "Failed: init recursive calls: 51. After deopt 50"

[Tobias Hartmann]

Hi,

please review the following patch for 8021775.

*Problem
*The compiler test for bug 8009761 checks if the stack size after 
deoptimization is the same as before by counting the number of possible 
recursive calls until a StackOverflowException occurs both before and 
after deoptimization. The test tries to trigger compilation by executing 
the method multiple times and enforces deoptimization by loading a 
previously unloaded class.

The test fails on multiple platforms.*
*Bug: https://bugs.openjdk.java.net/browse/JDK-8021775

*Solution**
*The test seems to be unstable, as there already occurred several test 
bugs (see 8010399 and 8012037). Enforcing compilation by executing a 
method multiple times is indeterministic. We have to make sure that the 
method is compiled and deoptimized exactly at those points in time where 
it is needed.

I reimplemented the test using the Whitebox API to deterministically 
trigger compilation and deoptimization.
Webrev: http://cr.openjdk.java.net/~anoll/8021775/webrev.00/
*
**Tests*
Executed test on machines where it previously failed (1k runs, no fails).

Thanks,
Tobias
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