[llvm] [llvm-exegesis] Add option to specify the number of measurement repetitions (PR #74276)

[Clement Courbet via llvm-commits]

================
@@ -24,14 +24,16 @@ class LatencyBenchmarkRunner : public BenchmarkRunner {
   LatencyBenchmarkRunner(const LLVMState &State, Benchmark::ModeE Mode,
                          BenchmarkPhaseSelectorE BenchmarkPhaseSelector,
                          Benchmark::ResultAggregationModeE ResultAggMode,
-                         ExecutionModeE ExecutionMode);
+                         ExecutionModeE ExecutionMode,
+                         unsigned BenchmarkRepeatCount);
   ~LatencyBenchmarkRunner() override;
 
 private:
   Expected<std::vector<BenchmarkMeasure>>
   runMeasurements(const FunctionExecutor &Executor) const override;
 
   Benchmark::ResultAggregationModeE ResultAggMode;
+  unsigned BenchmarkRepetitions;
----------------
legrosbuffle wrote:

Similarly to the previous comment on the flag, let's call this `NumMeasurements` to differenciate with the repetitions within the snippet. 

https://github.com/llvm/llvm-project/pull/74276