Make bitcast work for tensors of pointers #171
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I could be missing some high-level ideas about Triton Structured, here is my reasoning:
When bitcasting tensor<ptr> -> tensor<ptr<something_else>> arith::bitcast does not work and all memref/tensor casts. However no manipulations to the data are needed, this is a transformation like casting between different pointer types. I introduced ptr_cast on tts level which becomes unrealized conversion once all types for pointers are settled. This change fixes all comparison tests that require pointer casting at store. Let me know what you think!