asan: replace used python in various lit.cfg's with shim script

[philippjh]

This PR exchanges the used Python executable inside various test suites, when a IS_ASAN environment variable is present on Linux hosts. The behavior and achieved benefits are similar to what is happening inside Xilinx/llvm-project#436.

[philippjh]

@mgehre-amd I'm curious, whether we can detect ASan configurations by inspecting config.available_features just like in the LLVM PR I've linked above, instead of (manually) having IS_ASAN present in the environment.

[mgehre-amd]

@mgehre-amd I'm curious, whether we can detect ASan configurations by inspecting config.available_features just like in the LLVM PR I've linked above, instead of (manually) having IS_ASAN present in the environment.

I think it should work. torch-mlir is also using LLVM for the lit setup, and LLVM contains the generic code to set the features (here: https://github.com/llvm/llvm-project/blob/df728cf1d7959e214af68dbf4d6e3750fc7b5b13/llvm/utils/lit/lit/llvm/config.py#L125)
Can you try?

[philippjh]

I think it should work. torch-mlir is also using LLVM for the lit setup, and LLVM contains the generic code to set the features (here: https://github.com/llvm/llvm-project/blob/df728cf1d7959e214af68dbf4d6e3750fc7b5b13/llvm/utils/lit/lit/llvm/config.py#L125) Can you try?

Thank you for the pointer, I will give that a try.