nir, radv: Ignore mediump flag on IO variables.
For drivers that don't lower mediump shader inputs / outputs to 16-bit, it's better to ignore the mediump flag completely, letting mediump inputs / outputs work like normal 32-bit IO.
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For drivers that don't lower mediump shader inputs / outputs to 16-bit, it's better to ignore the mediump flag completely, letting mediump inputs / outputs work like normal 32-bit IO.