RFR (S) 8064749: -XX:-UseCompilerSafepoints breaks safepoint rendezvous

[Aleksey Shipilev]

Hi,

This is a patch that removes -XX:+-UseCompilerSafepoints from Hotspot:
 https://bugs.openjdk.java.net/browse/JDK-8064749
 http://cr.openjdk.java.net/~shade/8064749/webrev.01/

Do I understand it right we need a CCC to remove the product flag?

Testing: JPRT, vm.quick.testlist

Thanks,
-Aleksey.