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Fixes #104
- Map HLSL `nointerpolation` to GLSL `flat`
- When lowering a `struct` type varying input/output, look for interpolation modifiers along the "chain" from the leaf field up to the original shader input variable (and take the first one found)
- Not sure if this is strictly needed, but it seems like a reasonable policy
- Add `flat` to varying input of integer type, with no other interpolation modifier
- Note: I do *not* do anything to ignore a manually imposed interpolation modifier that might be incorrect
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