RFR(S):8211251:Default mask register for avx512 instructions

[Viswanathan, Sandhya]

Please find below a patch which cleans up K1 mask register handling for AVX 512 instructions.
Currently unmasked instructions are encoded using k1 register which requires k1 register to be initialized properly and also reinitialized across JNI and Runtime calls.
This patch encodes AVX 512 instructions as unmasked instruction with K0 encoding where the explicit mask register is not specified.

RFE: https://bugs.openjdk.java.net/browse/JDK-8211251
Webrev: http://cr.openjdk.java.net/~vdeshpande/k_register/webrev.00/

Best Regards,
Sandhya




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