Make it possible to log scanner progress (#66935)

We were using a null logger.

src/coreclr/tools/aot/ILCompiler.Compiler/Compiler/ILScanner.cs

@@ -106,7 +106,7 @@ private void CompileSingleThreaded(List<ScannedMethodNode> methodsToCompile)
             {
                 if (Logger.IsVerbose)
                 {
-                    Logger.Writer.WriteLine($"Compiling {methodCodeNodeNeedingCode.Method}...");
+                    Logger.Writer.WriteLine($"Scanning {methodCodeNodeNeedingCode.Method}...");
                 }
 
                 CompileSingleMethod(methodCodeNodeNeedingCode);

src/coreclr/tools/aot/ILCompiler.Compiler/Compiler/ILScannerBuilder.cs

@@ -69,6 +69,12 @@ public ILScannerBuilder UseParallelism(int parallelism)
             return this;
         }
 
+        public ILScannerBuilder UseLogger(Logger logger)
+        {
+            _logger = logger;
+            return this;
+        }
+
         public IILScanner ToILScanner()
         {
             var nodeFactory = new ILScanNodeFactory(_context, _compilationGroup, _metadataManager, _interopStubManager, _nameMangler, _preinitializationManager);

src/coreclr/tools/aot/ILCompiler/Program.cs

@@ -742,7 +742,8 @@ static string ILLinkify(string rootedAssembly)
                     .UseCompilationRoots(compilationRoots)
                     .UseMetadataManager(metadataManager)
                     .UseParallelism(_parallelism)
-                    .UseInteropStubManager(interopStubManager);
+                    .UseInteropStubManager(interopStubManager)
+                    .UseLogger(logger);
 
                 if (_scanDgmlLogFileName != null)
                     scannerBuilder.UseDependencyTracking(_generateFullScanDgmlLog ? DependencyTrackingLevel.All : DependencyTrackingLevel.First);