8335493: check_gc_overhead_limit should reset SoftRefPolicy::_should_clear_all_soft_refs

[mmyxym]

It's for fixing the issue should_clear_all_soft_refs is not reset after Parallel Full GC.

Tested test/hotspot/jtreg/gc with -XX:+UseParallelGC

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Issue

• JDK-8335493: check_gc_overhead_limit should reset SoftRefPolicy::_should_clear_all_soft_refs (Bug - P4)

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