RFR(S): 8215114: Fix indent and dead code in GCPolicyCounters

[Man Cao]

Hi all,

Can I have reviews for this small cleanup?

Webrev: https://cr.openjdk.java.net/~manc/8215114/webrev.00/
Bug: https://bugs.openjdk.java.net/browse/JDK-8215114

Thanks,
Man
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