RFR(S): 8134607: Remove per-compiler performance counters

[Claes Redestad]

Hello hotspot-compiler.dev,

anyone care to review this patch to remove per-compiler thread 
performance counters?

Bug: https://bugs.openjdk.java.net/browse/JDK-8134607

HotSpot webrev: http://cr.openjdk.java.net/~redestad/8134607/hotspot.01
JDK webrev: http://cr.openjdk.java.net/~redestad/8134607/jdk.01

CCC approved, no new test failures running JPRT against hs-comp.

/Claes