OpenCL is allowed to cast pointers, meaning they can resolve some type
mismatches this way. In logical SPIR-V, those are restricted. This new
pass legalizes such pointer cast when targeting logical SPIR-V.
For now, this pass supports 3 cases we witnessed:
- loading a vec3 from a vec4*.
- loading a scalar from a vec*.
- loading the 1st element of an array.
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Co-authored-by: Steven Perron <stevenperron@google.com>
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