[9] RFR (XS) 8059139: It should be possible to explicitly disable usage of TZCNT instr w/ -XX:-UseBMI1Instructions

[Vladimir Kozlov]

https://bugs.openjdk.java.net/browse/JDK-8059139
http://cr.openjdk.java.net/~kvn/8059139/webrev/

Before JDK-8055494 it was possible to disable usage of all BMI1-related 
instructions by passing -XX:-UseBMI1Instructions to JVM, but fix for 
JDK-8055494 made it impossible to disable usage of TZCNT.

Disable TZCNT with -XX:-UseBMI1Instructions flag specified on command line.

Testing jtreg,jprt