[8u40] RFR (XS) 8059139: It should be possible to explicitly disable usage of TZCNT instr w/ -XX:-UseBMI1Instructions

[Vladimir Kozlov]

Backport request. Changes was pushed into jdk9 last week. Nighties are 
fine. Changes are applied cleanly.

https://bugs.openjdk.java.net/browse/JDK-8059139
http://cr.openjdk.java.net/~kvn/8059139/webrev/
http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/3c4254d2df12

Thanks,
Vladimir