RFR (S): JDK-8141394: Remove the instrumentation added by JDK-6898948

[Bengt Rutisson]

Hi everyone,

Could I have a couple of reviews for this small patch to remove some 
debugging code?

http://cr.openjdk.java.net/~brutisso/8141394/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8141394

To help debug floating point issues for JDK-6902692, JDK-6898948 was 
used to add some instrumentation.

The instrumentation is guarded by a flag, which is false by default. So, 
unless the flag is enabled the instrumentation has no effect. We don't 
run with this flag in our testing and thus the instrumentation code is 
not being used.

The patch to add the instrumentation is very small. I've attached the 
patch to JDK-6902692 and my proposed change removes the instrumentation 
from the code base. That way we have the instrumentation available if we 
ever start working on JDK-6902692 but we don't have to have the 
debugging code in our code base.

Thanks,
Bengt