RFR(M) 8219403: JVMCIRuntime::adjust_comp_level should be replaced

[dean.long at oracle.com]

https://bugs.openjdk.java.net/browse/JDK-8219403
http://cr.openjdk.java.net/~dlong/8219403/webrev.2/

This change removes the problematic JVMCIRuntime::adjust_comp_level.  It
is based on previous work in Graal, graal-jvmci-8, and Metropolis by Tom,
Doug, and Vladimir.

I also problem-listed several tests that were causing noise in the test 
results.

dl