The only tests requiring the the compilation of SPARC, MIPS, and POWER for the long/nightly suite were "tests/gem5/multi_isa/test_multi_isa.py" and "gem5/stdlib/test_requires.py". As compilation of gem5 is quite costly, it'd best we simply remove these tests. They are minor and not very important. Compilation of these ISAs will continue to be tested via the compilation tests. Change-Id: I98b33eec5d0adb144109d32851033380f1641ad4 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/65193 Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: Bobby Bruce <bbruce@ucdavis.edu> Tested-by: kokoro <noreply+kokoro@google.com>