RFR(XXS): 8244278: Excessive code cache flushes and sweeps

[Man Cao]

Hi all,

Can I have reviews for this one-line change that fixes a bug and could
significantly improve performance?
Webrev: https://cr.openjdk.java.net/~manc/8244278/webrev.00/
Bug: https://bugs.openjdk.java.net/browse/JDK-8244278

It passes tier-1 tests locally, as well as
"vm/mlvm/meth/stress/compiler/deoptimize" (for the original JDK-8046809).

-Man