[Cutlass][Build] Clean up temporary files after build #16700
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Prior to this commit, compiling cutlass kernels left temporary files in the working directory. These temporary files are then left on disk after building. This commit updates the default behavior when building cutlass to produce files in a temporary directory, which is cleaned up on completion.
Since this change on its own would make it difficult to view and debug the generated cutlass code, this commit also maintains a copy of the generated source in the cutlass module. This can be inspected with
for ext in mod.attrs['external_modules']: print(ext.get_source())
.