RFR (XS): 8217371: C2: Incorrect LP64 guard in x86.ad after JDK-8210764 (Update avx512 implementation)

[Viswanathan, Sandhya]

Hi All,

Bug: https://bugs.openjdk.java.net/browse/JDK-8217371
Webrev: http://cr.openjdk.java.net/~sviswanathan/8217371/webrev.00/

The above webrev fixes the incorrect LP64 guard issue in x86.ad file.
I have corrected the guard to _LP64 and updated the spill/fill instructions.  This bug only affected the Knights family where AVX512VL is not supported.

I have tested it on SKX and Knights family with compiler jtreg tests.

Please review.

Best Regards,
Sandhya



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