Use the most recent instance when registering MSBuildLocator

src/Tools/AnalyzerRunner/Program.cs

@@ -45,7 +45,10 @@ public static async Task Main(string[] args)
                     cts.Cancel();
                 };
 
-            MSBuildLocator.RegisterDefaults();
+            // QueryVisualStudioInstances returns Visual Studio installations on .NET Framework, and .NET Core SDK
+            // installations on .NET Core. We use the one with the most recent version.
+            var msBuildInstance = MSBuildLocator.QueryVisualStudioInstances().OrderByDescending(x => x.Version).First();
+            MSBuildLocator.RegisterInstance(msBuildInstance);
 
             var incrementalAnalyzerRunner = new IncrementalAnalyzerRunner(options);
             var diagnosticAnalyzerRunner = new DiagnosticAnalyzerRunner(options);