RFR(S): 8075663: compiler/rangechecks/TestExplicitRangeChecks.java fails in compiler nightlies

[Roland Westrelin]

http://cr.openjdk.java.net/~roland/8075663/webrev.00/

When a jtreg test cannot be run properly with -Xcomp we include -Xmixed in the arguments to the test. But -Xcomp -Xmixed is not the same as -Xmixed when tiered is enabled because it doesn’t set Tier3InvokeNotifyFreqLog and Tier4InvocationThreshold back to their initial value.

Roland.