RFR 8076276 support for AVX512

[Berg, Michael C]

Hi Folks,

We (Intel) would like to contribute initial support for AVX512 (EVEX encoding, new register support, new ISA support, etc) for EVEX enabled microarchitectures.
The contribution is referenced as Bug ID 8076276 as a performance enhancement.

Please review this patch and comment as needed:

Bug-id: https://bugs.openjdk.java.net/browse/JDK-8076276

webrev:
http://cr.openjdk.java.net/~kvn/8076276/webrev

Superword optimizations covered on the vectorization path experience as much as 50% reduction in loop trace instruction count which make up the path length of EVEX encoded SIMD optimized loops.

Vladimir Koslov has offered to sponsor this patch.
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