8348610: GenShen: TestShenandoahEvacuationInformationEvent failed with setRegions >= regionsFreed: expected 1 >= 57

[satyenme]

Renaming ShenandoahEvacuationInformation.freedRegions to ShenandoahEvacuationInformation.freeRegions for clarity, and fixing incorrect assertion in TestShenandoahEvacuationInformationEvent.cpp

Tested with tier 1, tier 2, and tier 3 tests.

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Issue

• JDK-8348610: GenShen: TestShenandoahEvacuationInformationEvent failed with setRegions >= regionsFreed: expected 1 >= 57 (Bug - P4)

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