Enable -Werror on Travis CI

Signed-off-by: Pekka Enberg <penberg@kernel.org>
Advertise that we run on Darwin

Signed-off-by: Pekka Enberg <penberg@kernel.org>
interp: Switch to value type

Switch to value type in preparation for supporting primitives.

Signed-off-by: Pekka Enberg <penberg@kernel.org>
interp: iload_n

Signed-off-by: Pekka Enberg <penberg@kernel.org>
interp: iconst_n

Signed-off-by: Pekka Enberg <penberg@kernel.org>
interp: istore_n

Signed-off-by: Pekka Enberg <penberg@kernel.org>
interp: iadd

Signed-off-by: Pekka Enberg <penberg@kernel.org>