8370667: TestPinnedGarbage.java intermittent trigger assert Region \d+ pinning status is inconsistent

[earthling-amzn]

This broke recently because we expanded the scope of the assertion to check all regions. However, there are times when the pin status for a region is only updated if the region belongs to the generation being collected. This change restores the previous behavior of the assertion.

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• JDK-8370667: TestPinnedGarbage.java intermittent trigger assert Region \d+ pinning status is inconsistent (Bug - P4)

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