freedreno/ir3: handle FRAG IN's without interpolation specified
freedreno/ir3: handle FRAG IN's without interpolation specified

Fallback to picking based on semantic name.

Signed-off-by: Rob Clark <6f78cdb10adbe0a7fbbf4098125a51f401c77a5f@freedesktop.org>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler