RFR (XS): 8216290: Backport of 8215888 to JDK11u (Register to register spill may use AVX 512 move instruction on unsupported platform)

[Viswanathan, Sandhya]

This is a request to backport the 8215888<https://bugs.openjdk.java.net/browse/JDK-8215888> fix to JDK11u. The fix has been in JDK 12 branch for a couple of days now and passed nightly testing.

The backport bug request is at:
https://bugs.openjdk.java.net/browse/JDK-8216290

The backport webrev is at:
http://cr.openjdk.java.net/~sviswanathan/8216290/webrev.00/

Best Regards,
Sandhya

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