hg: jdk/sandbox: 8210853: JIT: C2 doesn't skip post barrier for new allocated objects

[chris.hegarty at oracle.com]

Changeset: 8d8702585652
Author:    kvn
Date:      2018-10-30 14:38 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/8d8702585652

8210853: JIT: C2 doesn't skip post barrier for new allocated objects
Summary: skip copy Region node when look for last allocation
Reviewed-by: thartmann, kvn
Contributed-by: kuaiwei.kw at alibaba-inc.com

! src/hotspot/share/opto/graphKit.cpp