git: openjdk/loom: fibers: Fix issues related to Windows calling convention.

[duke]

Changeset: 7a081efa
Author:    Ron Pressler <ron.pressler at oracle.com>
Date:      2020-06-15 18:51:08 +0000
URL:       https://git.openjdk.java.net/loom/commit/7a081efa

Fix issues related to Windows calling convention.

! src/hotspot/cpu/x86/sharedRuntime_x86_64.cpp
! src/hotspot/cpu/x86/stubGenerator_x86_64.cpp