Jefferson Le Quellec 81825687b4 [MLIR][GPUToLLVMSPV] Update ConvertGpuOpsToLLVMSPVOps's option (#118818) ...

## Description

This PR updates the `ConvertGpuOpsToLLVMSPVOps`'s option by replacing
the `index-bitwidth` with a boolean option `use-64bit-index` (similar to
the `ConvertGPUToSPIRV` option).

The reason for this modification is because the
`ConvertGpuOpsToLLVMSPVOps`:
> Generate LLVM operations to be ingested by a SPIR-V backend for gpu
operations

In the context of SPIR-V specifications only two physical addressing
models are allowed: `Physical32` and `Physical64`.

This change guarantees output sanity by preventing invalid or
unsupported index bitwidths from being specified.

2024-12-12 13:35:07 +01:00

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