hg: shenandoah/jdk9/hotspot: Correct way to fix Windows call convention issue

[zgu at redhat.com]

Changeset: c7bffe6debb7
Author:    zgu
Date:      2017-08-15 10:30 -0400
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/c7bffe6debb7

Correct way to fix Windows call convention issue

! src/cpu/x86/vm/stubGenerator_x86_64.cpp