[aarch64-port-dev ] jdk11 fastdebug seems to have slowed down.

[Dave Nuechterlein]

I pulled a jdk11 tree two days ago, and built both the release and fastdebug versions (--enable-debug).  Running specjbb 2015 v1.01, I get about the same result for HBIR that I have in the past on the release version.  The fastdebug posts a score 4.8x slower than the release.  I have never seen that kind of slowdown before.  I was seeing about 1.2x drop.  Anyone else seen fastedbug slow dramatically, or have an idea of what might have changed?  I pulled/updated again today, and it is about the same.

Dave