hg: shenandoah/jdk8/hotspot: Fix LRB use in LIRGenerator::do_UnsafeGetAndSetObject

[shade at redhat.com]

Changeset: cf0f69f962d9
Author:    shade
Date:      2020-02-25 21:10 +0100
URL:       https://hg.openjdk.java.net/shenandoah/jdk8/hotspot/rev/cf0f69f962d9

Fix LRB use in LIRGenerator::do_UnsafeGetAndSetObject
Reviewed-by: rkennke

! src/cpu/x86/vm/c1_LIRGenerator_x86.cpp