Minor fixes to for-loop type inference

pkg/front_end/testcases/inference/for_loop_initializer_expression.dart.strong.expect

Index: pkg/front_end/testcases/inference/for_loop_initializer_expression.dart.strong.expect
diff --git a/pkg/front_end/testcases/inference/for_loop_initializer_expression.dart.strong.expect b/pkg/front_end/testcases/inference/for_loop_initializer_expression.dart.strong.expect
new file mode 100644
index 0000000000000000000000000000000000000000..c82f417ba2a2bddb325bd0c0b1c263a2cb9f37ed
--- /dev/null
+++ b/pkg/front_end/testcases/inference/for_loop_initializer_expression.dart.strong.expect
@@ -0,0 +1,16 @@
+library test;
+import self as self;
+import "dart:core" as core;
+
+static method test() → void {
+  core::num x;
+  {
+    x = 0;
+    for (; x.{core::num::<}(10); x = x.{core::num::+}(1)) {
+      if(x is core::int) {
+        core::int y = x{core::int};
+      }
+    }
+  }
+}
+static method main() → dynamic {}