shader: use different variable declarations for signed and unsigned (i|u)mulextended
U)MUL_HI
(i|u)mulextended require that the all parameters are of the same signedness. Accordingly create both, the output variabale for MSB and the (unused) variable for the LSB to be of the same corresponding signedness. Closes: #17 (closed)
Fixes: dEQP- GLES31.functional.shaders.builtin_functions.integer.imulextended.*
Signed-off-by: Gert Wollny gert.wollny@collabora.com