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glsl: Fix inout qualifier handling in GLSL 4.40.
inout variables have q.in and q.out set. We were trying to set
xfb_buffer = 1 for shader output variables (and inadvertantly setting
it on inout parameters, too). But input_layout_mask doesn't have
xfb_buffer set, so it was seen as in invalid input qualifier.
This meant that all 'inout' parameters were broken.
Caught by running a WebGL conformance test in Chromium:
https://www.khronos.org/registry/webgl/sdk/tests/deqp/data/gles3/shaders/qualification_order.html?webglVersion=2
Fixes Piglit's tests/spec/glsl-4.40/compiler/inout-parameter-qualifier.
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Timothy Arceri <timothy.arceri@collabora.com>