RFR (11): [backport] 8221766: Load-reference barriers for Shenandoah

[Roland Westrelin]

>> http://cr.openjdk.java.net/~rkennke/backport-jdk11-JDK-8221766/webrev.01/

graphKit.cpp

You pulled an unrelated change:

3892   store_to_memory(ctrl, basic_plus_adr(str, coder_offset),
3893                   value, T_BYTE, coder_field_idx, MemNode::unordered);

cfgnode.hpp

That change doesn't seem needed

Otherwise looks good.

Roland.