ExitDetector: Don't short-circuit return on non-exiting case statements

pkg/analyzer/test/generated/all_the_rest_test.dart

Index: pkg/analyzer/test/generated/all_the_rest_test.dart
diff --git a/pkg/analyzer/test/generated/all_the_rest_test.dart b/pkg/analyzer/test/generated/all_the_rest_test.dart
index 8adce9de86a7d1c93efd445ac04e937c576edffe..ba1ba0082e83a854e5eb3d0ca2a3f25647ddd044 100644
--- a/pkg/analyzer/test/generated/all_the_rest_test.dart
+++ b/pkg/analyzer/test/generated/all_the_rest_test.dart
@@ -4033,6 +4033,20 @@ void f() {
     _assertNthStatementDoesNotExit(source, 0);
   }
 
+  void test_whileStatement_switchWithBreakWithLabel() {
+    Source source = addSource(r'''
+void f() {
+  x: while (true) {
+    switch (true) {
+      case false: break;
+      case true: break x;
+    }
+  }
+}
+''');
+    _assertNthStatementDoesNotExit(source, 0);
+  }
+
   void test_whileStatement_breakWithLabel_afterExting() {
     Source source = addSource(r'''
 void f() {