Apple M1: Add support for running unit tests on universal builds #9830
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This change adds support for unit testing to the universal binary build script through a new
--run_unit_testscommand line option. When this is specified, unit testing is performed for both the x86 and ARM64 slices that are built.It also fixes the PowerPC unit tests that were segfaulting on M1 silicon because they were not wrapping their code gen for W^X execution.