RFR(S): 8213947: [ARM32] unavailable VCNT instruction generation

[Boris Ulasevich]

Hi all,

Please review the change in ARM32 VM initialization codes:
VM_Version::initialize should disable UsePopCountInstruction on machines
without SIMD support to prevent further unavailable instructions generation.

https://bugs.openjdk.java.net/browse/JDK-8213947
http://cr.openjdk.java.net/~bulasevich/8213947/webrev.00/

Thanks,
Boris