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Reland "[llvm-exegesis] Fix preservation of RDI in subprocess mode (#…
…72458)" This reverts commit 186db1b. This relands commit 0718c1a. The REQUIRES flag in the test that was added only specified that the machine needed to have the capability to execute the snippet rather than actually run it with performance counters. This would work with --dummy-perf-counters, but that is not currently supported in the subprocess execution mode. So for now, we require the ability to actually perform measurements to prevent test failures in configurations that don't have libpfm or access to performance counters.
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