hg: shenandoah/jdk: Remove leftover include in C2

[roman at kennke.org]

Changeset: 867e649eb566
Author:    rkennke
Date:      2018-11-29 17:05 +0100
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/867e649eb566

Remove leftover include in C2

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