Friendlier messages when using dynamic patching (#25863)

packages/flutter_tools/lib/src/bundle.dart

@@ -80,18 +80,17 @@ Future<void> build({
 
     } else if (compilationTraceFilePath.isEmpty) {
       // Disable JIT snapshotting if flag is empty.
-      printStatus('JIT snapshot will be disabled for this build...');
+      printStatus('Code snapshot will be disabled for this build.');
       compilationTraceFilePath = null;
 
     } else if (!fs.file(compilationTraceFilePath).existsSync()) {
       // Be forgiving if compilation trace file is missing.
-      printError('Warning: Ignoring missing compiler training file $compilationTraceFilePath...');
-      printStatus('JIT snapshot will not use compiler training...');
+      printError('Warning: Ignoring missing compilation training file $compilationTraceFilePath.');
       final File tmp = fs.systemTempDirectory.childFile('flutterEmptyCompilationTrace.txt');
       compilationTraceFilePath = (tmp..createSync(recursive: true)).path;
 
     } else {
-      printStatus('JIT snapshot will use compiler training file $compilationTraceFilePath...');
+      printStatus('Code snapshot will use compilation training file $compilationTraceFilePath.');
     }
   }
 

packages/flutter_tools/lib/src/resident_runner.dart

@@ -602,7 +602,7 @@ abstract class ResidentRunner {
     for (FlutterDevice device in flutterDevices) {
       for (FlutterView view in device.views) {
         final int index = device.views.indexOf(view);
-        printStatus('Saving compilation trace for '
+        printStatus('Saving compilation training file for '
             '${device.device.name}${index == 0 ? '' :'/Isolate$index'}...');
 
         List<int> buffer;
@@ -619,7 +619,7 @@ abstract class ResidentRunner {
 
         outputFile.parent.createSync(recursive: true);
         outputFile.writeAsBytesSync(buffer);
-        printStatus('Compilation trace written to ${fs.path.relative(outputFile.path)}.');
+        printStatus('Compilation training written to ${fs.path.relative(outputFile.path)}.');
       }
     }
   }

packages/flutter_tools/lib/src/run_cold.dart

@@ -146,6 +146,9 @@ class ColdRunner extends ResidentRunner {
       }
     }
     if (haveDetails && !details) {
+      if (saveCompilationTrace) {
+        printStatus('Runtime compilation trace will be saved when flutter run quits...');
+      }
       printStatus('For a more detailed help message, press "h". To quit, press "q".');
     } else if (haveAnything) {
       printStatus('To repeat this help message, press "h". To quit, press "q".');