meson: add aarch64 memory barrier handling
meson: add aarch64 memory barrier handling

memory barriers for aarch64 ref: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.den0024a/CJAIAJFI.html

endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib