Generate constant buffer layout type for marshalling #574
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Note clear why this wasn't failing the build before
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Description
This PR updates the D2D1 shader generator to emit a type mapping the constant buffer of a shader. This is then used as local to perform marshalling back and forth between the managed instance and the native buffer. This results in much easier to read and understand generated code, and better perform (due to no stack alloc, more compact codegen, etc.).