CR for RFR 8170039

[Berg, Michael C]

Hi Folks,
Glibc uses a single convention for save/restore, so when the user asks for UseAVX={0,1,2} that excludes EVEX (3), we should offer non EVEX based save/restore for that path by not emitting the EVEX vector check code.

This code was tested as follows: hotspot jreg, SPECjvm2008, SPECjvm98 on hsw, skx and knl targets complete with no issues on 64-bit.

Bug-id: https://bugs.openjdk.java.net/browse/JDK-8170039

webrev: http://cr.openjdk.java.net/~mcberg/8170039/webrev.01

Regards,
Michael
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