Add types for map literal construction with kernel code.

pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart

Index: pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
diff --git a/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart b/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
index 4db25e9a336816b16279f7641225cce4d4c7a115..cf58dce460c029741be525f2d27f1f1e3a639014 100644
--- a/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
+++ b/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
@@ -263,12 +263,21 @@ class KernelAstAdapter {
   JumpTarget getTargetDefinition(ir.Node node) =>
       elements.getTargetDefinition(getNode(node));
 
+  ir.Class get mapLiteralClass =>
+      kernel.classes[_backend.helpers.mapLiteralClass];
+
   ir.Procedure get mapLiteralConstructor =>
       kernel.functions[_backend.helpers.mapLiteralConstructor];
 
   ir.Procedure get mapLiteralConstructorEmpty =>
       kernel.functions[_backend.helpers.mapLiteralConstructorEmpty];
 
+  ir.Procedure get mapLiteralUntypedEmptyMaker =>
+      kernel.functions[_backend.helpers.mapLiteralUntypedEmptyMaker];
+
+  ir.Procedure get mapLiteralUntypedMaker =>
+      kernel.functions[_backend.helpers.mapLiteralUntypedMaker];
+
   MemberElement get jsIndexableLength => _backend.helpers.jsIndexableLength;
 
   ir.Procedure get checkConcurrentModificationError =>