Philippe Tillet fa0fbc937f [FRONTEND][BACKEND][OPTIMIZER] Loops now use 64-bit indices when necessary (#1261) ...

* Frontend:
  - `int` kernel arguments are always signed
- Loop induction variable is now determine by integer promotion on
lb/ub/step
* Optimizer:
  -  Added new ExtractSliceOp that enforces 32-bit offsets
* Backend:
    - Use 64-bit indices when lowering functions and control flow
    - Removed `idx_val` macro and replaced it with `i32_val`
    - Cleaned up comments
- Added new ArithToIndex pass to make sure operations on indices are
done with the `index` dialect, that gets converted to LLVM separately
using a 64-bit target

2023-03-01 23:09:48 -08:00

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