[mlir][spirv] Add pattern matching for arith.index_cast i1 to index for ArithToSPIRV (#155729) Currently, `arith.index_cast` gets converted to `OpSConvert`: https://github.com/llvm/llvm-project/blob/9bf5bf3baf3c7aec82cdd235c6a2fd57b4dd55ab/mlir/lib/Conversion/ArithToSPIRV/ArithToSPIRV.cpp#L1331 [OpSConvert requires its operands to be of integer type](https://registry.khronos.org/SPIR-V/specs/unified1/SPIRV.html#OpSConvert), which poses an issue for `i1` since SPIRV distinguishes between booleans and integers. As a result, the following example doesn't get converted, leaving behind illegal ops: ``` %0 = arith.index_cast %arg0 : i1 to index ``` This PR adds additional logic to convert `arith.index_casts` to SPIRV dialect when casting from `i1` to `index`. Converting `index_cast`s from `index` to `i1` is a part of https://github.com/llvm/llvm-project/pull/156031.
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