Fix resynthesis tests after dead code detection improvements.

pkg/analyzer/test/src/summary/resynthesize_test.dart

Index: pkg/analyzer/test/src/summary/resynthesize_test.dart
diff --git a/pkg/analyzer/test/src/summary/resynthesize_test.dart b/pkg/analyzer/test/src/summary/resynthesize_test.dart
index eea778b310185fbb53f1d66ce886671e71a6761e..7e682a9bf25c43f04f9e0254a64f68fa6f61aea4 100644
--- a/pkg/analyzer/test/src/summary/resynthesize_test.dart
+++ b/pkg/analyzer/test/src/summary/resynthesize_test.dart
@@ -3652,7 +3652,8 @@ get g {
   }
 
   test_localLabels_inConstructor() {
-    checkLibrary(r'''
+    checkLibrary(
+        r'''
 class C {
   C() {
     aaa: while (true) {}
@@ -3662,11 +3663,13 @@ class C {
     }
   }
 }
-''');
+''',
+        allowErrors: true);
   }
 
   test_localLabels_inMethod() {
-    checkLibrary(r'''
+    checkLibrary(
+        r'''
 class C {
   m() {
     aaa: while (true) {}
@@ -3676,11 +3679,13 @@ class C {
     }
   }
 }
-''');
+''',
+        allowErrors: true);
   }
 
   test_localLabels_inTopLevelFunction() {
-    checkLibrary(r'''
+    checkLibrary(
+        r'''
 main() {
   aaa: while (true) {}
   bbb: switch (42) {
@@ -3688,7 +3693,8 @@ main() {
       break;
   }
 }
-''');
+''',
+        allowErrors: true);
   }
 
   test_localVariables_inConstructor() {