RFR(XS): JDK-8207746: C2: Lucene crashes on AVX512 instruction: Fix

[Deshpande, Vivek R]

Hi All

I have a patch for the fix for Lucene crash using AVX512.
You can find the webrev at this location:
http://cr.openjdk.java.net/~vdeshpande/Lucene_avx512/webrev.00/
Could you please review the change.

The EFLAGS register was getting clobbered, causing the result of vptest instruction getting clobbered, leading to crash.
This fix avoids the clobbering of the result of the vptest instruction.
I tested the fix with elastic-search docker container on skylake server. The container is running for more than 18 hours now.

Regards,
Vivek
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