[llvm-exegesis] Program should succeed if benchmark returns StringError.

[gchatelet]

Summary

Fix for https://bugs.llvm.org/show_bug.cgi?id=37759.

[courbet]

tools/llvm-exegesis/llvm-exegesis.cpp

223

EXIT_FAILURE ?

[gchatelet]

Use EXIT_FAILURE instead of 1.

tools/llvm-exegesis/llvm-exegesis.cpp

static void analysisMain() {
 
   std::string Error;
   const auto *TheTarget =
       llvm::TargetRegistry::lookupTarget(Points[0].LLVMTriple, Error);
   if (!TheTarget) {
     llvm::errs() << "unknown target '" << Points[0].LLVMTriple << "'\n";
     return;
   }
-  const auto Clustering = llvm::cantFail(InstructionBenchmarkClustering::create(
+  const auto Clustering = ExitOnErr(InstructionBenchmarkClustering::create(
       Points, AnalysisNumPoints, AnalysisEpsilon));
 
   const Analysis Analyzer(*TheTarget, Clustering);
 
   maybeRunAnalysis<Analysis::PrintClusters>(Analyzer, "analysis clusters",
                                             AnalysisClustersOutputFile);
   maybeRunAnalysis<Analysis::PrintSchedClassInconsistencies>(
       Analyzer, "sched class consistency analysis",
       AnalysisInconsistenciesOutputFile);
 }
 
 } // namespace exegesis
 
 int main(int Argc, char **Argv) {
   llvm::cl::ParseCommandLineOptions(Argc, Argv, "");
 
+  exegesis::ExitOnErr.setExitCodeMapper([](const llvm::Error &Err) {
+    if (Err.isA<llvm::StringError>())
+      return EXIT_SUCCESS;
+    return 1;
+  });
+
   if (BenchmarkMode == BenchmarkModeE::Analysis) {
     exegesis::analysisMain();
   } else {
     exegesis::benchmarkMain();
   }
   return EXIT_SUCCESS;
 }