Implement type inference of getters/setters based on inheritance.

pkg/front_end/lib/src/fasta/kernel/kernel_field_builder.dart

Index: pkg/front_end/lib/src/fasta/kernel/kernel_field_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_field_builder.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_field_builder.dart
index 1a0c7cc87a59ed71d48b960fd2da9f5648c79156..a17f1ce7d6f2e67492d669f1e1cb6e6a7128a1f6 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_field_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_field_builder.dart
@@ -31,7 +31,7 @@ import 'kernel_builder.dart'
     show Builder, FieldBuilder, KernelTypeBuilder, MetadataBuilder;
 
 class KernelFieldBuilder extends FieldBuilder<Expression> {
-  final Field field;
+  final KernelField field;
   final List<MetadataBuilder> metadata;
   final KernelTypeBuilder type;
   final Token initializerTokenForInference;
@@ -73,7 +73,7 @@ class KernelFieldBuilder extends FieldBuilder<Expression> {
       ..hasImplicitSetter = isInstanceMember && !isConst && !isFinal
       ..isStatic = !isInstanceMember;
     if (isEligibleForInference) {
-      library.loader.typeInferenceEngine.recordField(field);
+      library.loader.typeInferenceEngine.recordMember(field);
     }
     return field;
   }