perfcollect: don't restore symbols for local builds (#2384)

Author: adamsitnik

src/BenchmarkDotNet/Diagnosers/PerfCollectProfiler.cs

@@ -194,10 +194,14 @@ private void StopCollection(DiagnoserActionParameters parameters)
 
         private void EnsureSymbolsForNativeRuntime(DiagnoserActionParameters parameters)
         {
+            if (parameters.BenchmarkCase.GetToolchain() is CoreRunToolchain)
+            {
+                return; // it's not needed for a local build of dotnet runtime
+            }
+
             string cliPath = parameters.BenchmarkCase.GetToolchain() switch
             {
                 CsProjCoreToolchain core => core.CustomDotNetCliPath,
-                CoreRunToolchain coreRun => coreRun.CustomDotNetCliPath.FullName,
                 NativeAotToolchain nativeAot => nativeAot.CustomDotNetCliPath,
                 _ => DotNetCliCommandExecutor.DefaultDotNetCliPath.Value
             };
@@ -251,4 +255,4 @@ private FileInfo GetTraceFile(DiagnoserActionParameters parameters, string exten
             => new (ArtifactFileNameHelper.GetTraceFilePath(parameters, creationTime, extension)
                     .Replace(" ", "_")); // perfcollect does not allow for spaces in the trace file name
     }
-}
+}