[glsl-in] UnknownType when using sampler as function parameter

[Vipitis]

Description
According to the spec, samplers can be function parameters.

Repro steps
The minimal example can be found directly in the documentation:

void Function(in sampler2D myTexture);

Gives you error: Unknown type: sampler2D

If you omit the in qualifier you get a more confusing error.

void Function2(sampler2D myTexture);

error: Expected RightParen, found Identifier("sampler2D")

Platform
wgpu 0.19.1 via wgpu-native 0.19.1.1 via wgpu-py 0.14.1 via wgpu-shadertoy
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