RFR (XXS) JDK-8164124,The fix for JDK-8071770 incorrectly uses os::elapsed_counter()

[Joseph Provino]

Please review this one line change:

jlong G1CollectedHeap::millis_since_last_gc() {

This: jlong now = os::elapsed_counter() / NANOSECS_PER_MILLISEC;

Should be: jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC;

CR: JDK-8164124 <https://bugs.openjdk.java.net/browse/JDK-8164124> The 
fix for JDK-8071770 incorrectly uses os::elapsed_counter()

Webrev: http://cr.openjdk.java.net/~jprovino/8164124/webrev.00

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