`tbuffer` or `TextureBuffer` use causes silent failure due to layout rules about slang HOT 5 CLOSED

I suppose there are 2 problems to address here:

1. An error should be more clear here (some ASSERT)?
2. Add layout rules to tbuffer

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I agree. Apologies, I was going for the least amount of work needed to address the current behavior. But you're right, would be good to have the functionality.

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This also applies to TextureBuffer (note: it's much less used based on memory from previous experience).

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I suggest to use SLANG_UNIMPLEMENTED for now and close. And create a new issue for the actual implementation.

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A seperate issue was made to implement spirv and metal for TextureBuffer (significant and simmilar changes required): #4435

hlsl and glsl should both work once the linked PR is merged.

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