hg: shenandoah/jdk10/hotspot: Fixed C calling convention of shenandoah_wb() on Windows

[zgu at redhat.com]

Changeset: 5bc87d329720
Author:    zgu
Date:      2017-07-26 15:19 -0400
URL:       http://hg.openjdk.java.net/shenandoah/jdk10/hotspot/rev/5bc87d329720

Fixed C calling convention of shenandoah_wb() on Windows

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