RFR [12] (XS): http://cr.openjdk.java.net/~shade/8217467/webrev.01/

[Aleksey Shipilev]

Bug:
  https://bugs.openjdk.java.net/browse/JDK-8217467

Fix:
  http://cr.openjdk.java.net/~shade/8217467/webrev.01/

This is found and verified by Shenandoah CTW tests that verifies barrier placement. Base64 intrinsic
is new, and only enabled on modern hardware (I think you need AVX512). I'd like to push this fix to
jdk12.

Testing: Shenandoah CTW tests, hotspot tier1 (includes compiler/intrinsics/base64), jdk-submit12
(running)

Thanks,
-Aleksey

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