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The two functions are `get_cpu_types_str_set()` which returns a set of valid CPUTypes as strings, and `get_cpu_type_from_str()` which will return a CPUType enum given an input string. The purpose of these functions is to aid and standardize user input parameters or environment variables. Test scripts are updated accordingly. Change-Id: I7cb9263321fe36bc8a7530edfd0d8e8bbd329e0e Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/58491 Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu> Maintainer: Bobby Bruce <bbruce@ucdavis.edu> Tested-by: kokoro <noreply+kokoro@google.com>