[hlsl-out] Use the namer to sanitise entrypoint input/output struct names

[expenses]

This is especially relevant for shaders generated by rust-gpu.

Before:

struct VertexOutput_single_view::vertex_skybox_mirrored {
    float3 member_1 : LOC0;
    float4 member : SV_Position;
};

After:

struct VertexOutput_single_viewvertex_skybox_mirrored {
    float3 member_1 : LOC0;
    float4 member : SV_Position;
};

[cwfitzgerald]

Code looks fine, my only comment is do we want to document how we sanitize names somewhere, as users need to be able to match the names perfectly in the entry point declarations in wgpu

[expenses]

Code looks fine, my only comment is do we want to document how we sanitize names somewhere, as users need to be able to match the names perfectly in the entry point declarations in wgpu

IMO I should be able to able to tell wgpu to create a pipeline with a foo::bar shader entry point, even if the name has been sanitized in the shader. I guess the best way to accomplish this is to expose a naga function that sanitized the entry points for lookups.

[expenses]

I'll look into it when I get closer to having my code work on DX12