hg: jdk9/hs/hotspot: 8164954: split_if creates empty phi and region nodes

[nils.eliasson at oracle.com]

Changeset: 38f38c10a11d
Author:    neliasso
Date:      2017-03-06 14:08 +0100
URL:       http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/38f38c10a11d

8164954: split_if creates empty phi and region nodes
Summary: Don't split if all edges will be moved to new phi
Reviewed-by: kvn, vlivanov

! src/share/vm/opto/ifnode.cpp