RFR (XXS) JDK-8168038 Some methods in G1RemSet are virtual unnecessarily

[Joseph Provino]

Please review this tiny change.

CR: JDK-8168038 <https://bugs.openjdk.java.net/browse/JDK-8168038> Some 
methods in G1RemSet are virtual unnecessarily

Webrev: http://cr.openjdk.java.net/~jprovino/8168038/webrev.00

thanks.

joe

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