Revert "Fix bad type-inferrence for logical expressions."

tests/compiler/dart2js/simple_inferrer_and_or_test.dart

Index: tests/compiler/dart2js/simple_inferrer_and_or_test.dart
diff --git a/tests/compiler/dart2js/simple_inferrer_and_or_test.dart b/tests/compiler/dart2js/simple_inferrer_and_or_test.dart
index 4611de9709dd73528fe02b3709ace1e9fad73d90..97531a6846a85da489047542b61f7fc5d85a6667 100644
--- a/tests/compiler/dart2js/simple_inferrer_and_or_test.dart
+++ b/tests/compiler/dart2js/simple_inferrer_and_or_test.dart
@@ -45,31 +45,6 @@ returnDyn6() {
   return a;
 }
 
-returnDyn7b(x) => x;
-
-returnDyn7() {
-  var a = "foo";
-  if (a.length == 3) a = 52;
-  if ((a is int) || (a is String && true)) returnDyn7b(a);
-  return a;
-}
-
-returnDyn8(x) => x;
-
-test8() {
-  var a = "foo";
-  if (a.length == 3) a = 52;
-  if ((false && a is! String) || returnDyn8(a)) return a;
-}
-
-returnDyn9(x) => x;
-
-test9() {
-  var a = "foo";
-  if (a.length == 3) a = 52;
-  if (!(a is bool && a is bool)) returnDyn9(a);
-}
-
 main() {
   returnDyn1();
   returnDyn2();
@@ -77,9 +52,6 @@ main() {
   returnDyn4();
   returnDyn5();
   returnDyn6();
-  returnDyn7();
-  test8();
-  test9();
 }
 """;
 
@@ -105,9 +77,5 @@ void main() {
     checkReturn('returnDyn4', compiler.typesTask.dynamicType.nonNullable());
     checkReturn('returnDyn5', compiler.typesTask.dynamicType.nonNullable());
     checkReturn('returnDyn6', compiler.typesTask.dynamicType.nonNullable());
-    checkReturn('returnDyn7', subclassOfInterceptor);
-    checkReturn('returnDyn7b', subclassOfInterceptor);
-    checkReturn('returnDyn8', subclassOfInterceptor);
-    checkReturn('returnDyn9', subclassOfInterceptor);
   }));
 }