Add ConstructorBodyEntity

pkg/compiler/lib/src/common_elements.dart

Index: pkg/compiler/lib/src/common_elements.dart
diff --git a/pkg/compiler/lib/src/common_elements.dart b/pkg/compiler/lib/src/common_elements.dart
index 97b43f3650ceeadbbb6b1e7984c746f0548774a2..898d093551624189690727eecc3bc0f8c58ecb00 100644
--- a/pkg/compiler/lib/src/common_elements.dart
+++ b/pkg/compiler/lib/src/common_elements.dart
@@ -1230,6 +1230,10 @@ abstract class ElementEnvironment {
   void forEachConstructor(
       ClassEntity cls, void f(ConstructorEntity constructor));
 
+  /// Calls [f] for every constructor body in [cls].
+  void forEachConstructorBody(
+      ClassEntity cls, void f(ConstructorBodyEntity constructorBody));
+
   /// Returns the superclass of [cls].
   ///
   /// If [skipUnnamedMixinApplications] is `true`, unnamed mixin applications