__asm__ is more robust to compilation flags. Change-Id: Ic7ca6e38ddd439dcfc4a62ef272ecea62416b4be Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com> Reviewed-on: https://review.coreboot.org/13905 Tested-by: build bot (Jenkins) Reviewed-by: Julius Werner <jwerner@chromium.org>