Perform type inference on constructor field initializer expressions.

pkg/front_end/testcases/inference/bug30251.dart.strong.expect

Index: pkg/front_end/testcases/inference/bug30251.dart.strong.expect
diff --git a/pkg/front_end/testcases/inference/bug30251.dart.strong.expect b/pkg/front_end/testcases/inference/bug30251.dart.strong.expect
new file mode 100644
index 0000000000000000000000000000000000000000..c3087fecfb09883b23b14b5052402bc2b7ca252a
--- /dev/null
+++ b/pkg/front_end/testcases/inference/bug30251.dart.strong.expect
@@ -0,0 +1,13 @@
+library test;
+import self as self;
+import "dart:core" as core;
+
+class C extends core::Object {
+  final field dynamic x;
+  constructor •(core::int p) → void
+    : self::C::x = self::f<core::int>(1.{core::num::+}(p)), super core::Object::•()
+    ;
+}
+static method f<T extends core::Object>(self::f::T t) → self::f::T
+  return t;
+static method main() → dynamic {}