Infer the types of initializing formals from the corresponding fields.

pkg/front_end/testcases/uninitialized_fields.dart.outline.expect

Index: pkg/front_end/testcases/uninitialized_fields.dart.outline.expect
diff --git a/pkg/front_end/testcases/uninitialized_fields.dart.outline.expect b/pkg/front_end/testcases/uninitialized_fields.dart.outline.expect
index b3abbbbca0ea2ef153189da624c7e4635ffc22ba..09ac4e380dfde87c70869765cbec26a5e0e7c2ef 100644
--- a/pkg/front_end/testcases/uninitialized_fields.dart.outline.expect
+++ b/pkg/front_end/testcases/uninitialized_fields.dart.outline.expect
@@ -9,19 +9,19 @@ class Uninitialized extends core::Object {
 }
 class PartiallyInitialized extends core::Object {
   field core::int x;
-  constructor •(dynamic x) → void
+  constructor •(core::int x) → void
     ;
   constructor noInitializer() → void
     ;
 }
 class Initialized extends core::Object {
   field core::int x;
-  constructor •(dynamic x) → void
+  constructor •(core::int x) → void
     ;
 }
 class Forwarding extends core::Object {
   field core::int x;
-  constructor initialize(dynamic x) → void
+  constructor initialize(core::int x) → void
     ;
   constructor •(core::int arg) → void
     ;