Split up TypeInferrer class.

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

Index: pkg/front_end/lib/src/fasta/kernel/kernel_enum_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_enum_builder.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_enum_builder.dart
index d0bf021010c845bada6dd29cb9c1976a4eee5c45..12693cc032911e2f20b2d55b91dc74f06f5a7ce7 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_enum_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_enum_builder.dart
@@ -125,7 +125,7 @@ class KernelEnumBuilder extends SourceClassBuilder
     ///     }
     members["index"] = new KernelFieldBuilder(
         astFactory,
-        parent.loader.topLevelTypeInferrer,
+        parent.loader.typeInferenceEngine,
         null,
         intType,
         "index",
@@ -152,7 +152,7 @@ class KernelEnumBuilder extends SourceClassBuilder
     List<MapEntry> toStringEntries = <MapEntry>[];
     KernelFieldBuilder valuesBuilder = new KernelFieldBuilder(
         astFactory,
-        parent.loader.topLevelTypeInferrer,
+        parent.loader.typeInferenceEngine,
         null,
         listType,
         "values",
@@ -185,7 +185,7 @@ class KernelEnumBuilder extends SourceClassBuilder
       }
       KernelFieldBuilder fieldBuilder = new KernelFieldBuilder(
           astFactory,
-          parent.loader.topLevelTypeInferrer,
+          parent.loader.typeInferenceEngine,
           null,
           selfType,
           name,