[llvm] [clang-tools-extra] [clang] [libc] [llvm-exegesis] Add middle half repetition mode (PR #77020)

[Aiden Grossman via cfe-commits]

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@@ -455,6 +466,26 @@ static void runBenchmarkConfigurations(
               Measurement.PerSnippetValue, NewMeasurement.PerSnippetValue);
         }
       }
+    } else if (RepetitionMode ==
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boomanaiden154 wrote:

Moved them to `ResultAggregator.cpp` and added unit tests.

https://github.com/llvm/llvm-project/pull/77020