7190666: G1: assert(_unused == 0) failed: Inconsistency in PLAB stats Summary: Reset the fields in ParGCAllocBuffer, that are used for accumulating values for the ResizePLAB sensors in PLABStats, to zero after flushing the values to the PLABStats fields. Flush PLABStats values only when retiring the final allocation buffers prior to disposing of a G1ParScanThreadState object, rather than when retiring every allocation buffer. Reviewed-by: jwilhelm, jmasa, ysr

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