hg: shenandoah/jdk: Immediate garbage ratio should not go over 100%

[ashipile at redhat.com]

Changeset: 8aaafef81fa3
Author:    shade
Date:      2018-04-11 11:43 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/8aaafef81fa3

Immediate garbage ratio should not go over 100%

! src/hotspot/share/gc/shenandoah/shenandoahCollectorPolicy.cpp
! src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
! src/hotspot/share/gc/shenandoah/shenandoahHeap.hpp