hg: shenandoah/jdk8u/hotspot: Correct way to fix Windows call convention issue

[zgu at redhat.com]

Changeset: dbf4a74655c8
Author:    zgu
Date:      2017-08-15 10:30 -0400
URL:       http://hg.openjdk.java.net/shenandoah/jdk8u/hotspot/rev/dbf4a74655c8

Correct way to fix Windows call convention issue

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