RFR (XS) 8153277: [TESTBUG] gc/arguments/TestMaxMinHeapFreeRatioFlags is too sensitive for stray allocations in verifyRatio

[Aleksey Shipilev]

Hi,

Please review a preemptive fix in TestMaxMinHeapFreeRatioFlags test.
This failure only reproduces when you switch the JEP 280 concat strategy
to something more advanced than it is now.

The test would fail if we silently bring more objects in the heap in the
middle of the test. Notably, this will happen inside of verifyRatio
helper method which does a String concat -- on first invocation it will
lazily initialize j.l.invoke infra. We need to prime the utility methods
before using them within the test.

Bug:
  https://bugs.openjdk.java.net/browse/JDK-8153277

Webrev:
  http://cr.openjdk.java.net/~shade/8153277/webrev.00/

Testing: offending test; going to run JPRT -testset hotspot during a push.

Thanks,
-Aleksey

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