hg: shenandoah/jdk: C1 xchg_oop needs temp register operand

[ashipile at redhat.com]

Changeset: dd49c1f8d05d
Author:    shade
Date:      2018-06-06 19:24 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/dd49c1f8d05d

C1 xchg_oop needs temp register operand

! src/hotspot/cpu/x86/c1_LIRAssembler_x86.cpp
! src/hotspot/cpu/x86/c1_LIRGenerator_x86.cpp