glsl: don't inline intrinsics for mediump

They have an empty fxn body, trying to handle them results in the
intrinsic call being expanded into a no-op.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6073>
1 file changed