Implement various getters on DillMember.

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

Index: pkg/front_end/lib/src/fasta/dill/dill_member_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/dill/dill_member_builder.dart b/pkg/front_end/lib/src/fasta/dill/dill_member_builder.dart
index 2cb18ef7fca362551d98bfe35437a4078a3f2a4f..a83da33941de3d6b32f81e38d56682d320a47f1c 100644
--- a/pkg/front_end/lib/src/fasta/dill/dill_member_builder.dart
+++ b/pkg/front_end/lib/src/fasta/dill/dill_member_builder.dart
@@ -30,14 +30,20 @@ class DillMemberBuilder extends MemberBuilder {
 
   bool get isConstructor => member is Constructor;
 
-  bool get isFactory {
-    if (member is Procedure) {
-      Procedure procedure = member;
-      return procedure.kind == ProcedureKind.Factory;
-    } else {
-      return false;
-    }
+  ProcedureKind get kind {
+    final member = this.member;
+    return member is Procedure ? member.kind : null;
   }
+
+  bool get isRegularMethod => identical(ProcedureKind.Method, kind);
+
+  bool get isGetter => identical(ProcedureKind.Getter, kind);
+
+  bool get isSetter => identical(ProcedureKind.Setter, kind);
+
+  bool get isOperator => identical(ProcedureKind.Operator, kind);
+
+  bool get isFactory => identical(ProcedureKind.Factory, kind);
 }
 
 int computeModifiers(Member member) {