gs: Verify consistency checking of geometry shader input layouts.
gs: Verify intra-shader checking of input layout vs. explicitly sized arrays.
gs: Verify inter-shader checking of input layout vs. explicitly sized arrays.
gs: Verify intra-shader checking of input layout vs. implicitly sized arrays.
gs: Verify inter-shader checking of input layout vs. implicitly sized arrays.
gs: Verify consistency checking of explicitly sized input arrays.
gs: Verify checking of sized vs. unsized geometry shader input arrays.
gs: Verify that an error is generated if no input layout is specified.