[cfe] Create SourceConstructorBuilder from ConstructorDeclaration

This is a step toward supporting synthetic declaration to be created
together with fragment-based declarations.

A ConstructorReferences object is added to split the references for
constructors and their tear-off from the creation of the AST nodes,
enabling moving the creation of AST nodes for constructors to
buildOutlineNodes.

Change-Id: I0af9a6a51107092026c2dfd2031093f74c02e101
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/435122
Reviewed-by: Chloe Stefantsova <[email protected]>
Commit-Queue: Johnni Winther <[email protected]>

Author: johnniwinther

pkg/front_end/lib/src/builder/library_builder.dart

@@ -25,6 +25,7 @@ import '../base/problems.dart' show internalProblem;
 import '../base/scope.dart';
 import '../fragment/fragment.dart';
 import '../kernel/body_builder_context.dart';
+import '../source/name_scheme.dart';
 import '../source/offset_map.dart';
 import '../source/outline_builder.dart';
 import '../source/source_class_builder.dart';
@@ -336,6 +337,8 @@ abstract class LibraryBuilder implements Builder, ProblemReporting {
   /// Returns the [Library] built by this builder.
   Library get library;
 
+  LibraryName get libraryName;
+
   @override
   Uri get fileUri;
 

pkg/front_end/lib/src/dill/dill_library_builder.dart

@@ -24,6 +24,7 @@ import '../codes/cfe_codes.dart'
     show LocatedMessage, Message, Severity, noLength, templateUnspecified;
 import '../kernel/constructor_tearoff_lowering.dart';
 import '../kernel/utils.dart';
+import '../source/name_scheme.dart';
 import 'dill_class_builder.dart' show DillClassBuilder;
 import 'dill_extension_builder.dart';
 import 'dill_extension_type_declaration_builder.dart';
@@ -104,6 +105,9 @@ class DillLibraryBuilder extends LibraryBuilderImpl {
   @override
   final Library library;
 
+  @override
+  late final LibraryName libraryName = new LibraryName(library.reference);
+
   @override
   DillLoader loader;
 

pkg/front_end/lib/src/dill/dill_member_builder.dart

@@ -336,7 +336,6 @@ class DillConstructorBuilder extends DillMemberBuilder
   Constructor get invokeTarget => constructor;
 
   @override
-  // Coverage-ignore(suite): Not run.
   Reference get invokeTargetReference => constructor.reference;
 
   @override