[15] RFR 8245961: Shenandoah: move some root marking to concurrent phase

Zhengyu Gu zgu at redhat.com
Mon Jun 1 18:23:15 UTC 2020

Please review this patch that moves following root scanning to 
concurrent phase.

1) JNIHandle roots
2) VM global roots
3) CLD roots

and also consolidates code cache root marking.

Bug: https://bugs.openjdk.java.net/browse/JDK-8245961
Webrev: http://cr.openjdk.java.net/~zgu/JDK-8245961/webrev.00/




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