add lit tests for pass ConvertParalleltoGPU2

[xys-syx]

The lit tests is generated using
enzymexlamlir-opt convert-parallel-to-gpu1.mlir --pass-pipeline="builtin.module(convert-parallel-to-gpu1,gpu-kernel-outlining,canonicalize)" &> convert-parallel-to-gpu2.mlir

Could any one tell me if there is a better way to generate the lit tests for pass ConvertParalleltoGPU2

[ivanradanov]

Usually I would try to manually reduce tests to only test what the pass is actually doing. e.g. do we need all of the gpu kernels or only one would suffice?

[xys-syx]

Yeah, I have limited the test size, thank you

[xys-syx]

Sorry, the previous versions fails, could you help review again?