Ensure locations are always provided, but don't store them yet.

pkg/front_end/lib/src/fasta/builder/procedure_builder.dart

Index: pkg/front_end/lib/src/fasta/builder/procedure_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/builder/procedure_builder.dart b/pkg/front_end/lib/src/fasta/builder/procedure_builder.dart
index fb4409225ba97b14cbc08f8a4b50f9729a8d1222..44cb46fbb80f54251584b1c29cfda86a310cba88 100644
--- a/pkg/front_end/lib/src/fasta/builder/procedure_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/procedure_builder.dart
@@ -14,6 +14,7 @@ import 'package:kernel/ast.dart' show
 import 'builder.dart' show
     Builder,
     FormalParameterBuilder,
+    LibraryBuilder,
     MemberBuilder,
     MetadataBuilder,
     TypeBuilder,
@@ -36,7 +37,9 @@ abstract class ProcedureBuilder<T extends TypeBuilder> extends MemberBuilder {
   final List<FormalParameterBuilder> formals;
 
   ProcedureBuilder(this.metadata, this.modifiers, this.returnType, this.name,
-      this.typeVariables, this.formals);
+      this.typeVariables, this.formals, LibraryBuilder compilationUnit,
+      int charOffset)
+      : super(compilationUnit, charOffset);
 
   AsyncMarker get asyncModifier;