Record static types in the desugaring of null-aware property gets.

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

Index: pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart
index 1348b9eb65c91fd92dc649e7bf7401d415f5cb74..30f7821950e7f2954dd871e1a04c48e2c6261dbe 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart
@@ -1450,8 +1450,11 @@ class KernelNullAwarePropertyGet extends Let implements KernelExpression {
   @override
   DartType _inferExpression(
       KernelTypeInferrer inferrer, DartType typeContext, bool typeNeeded) {
-    return inferrer.inferPropertyGet(this, variable.initializer, fileOffset,
-        _desugaredGet, typeContext, typeNeeded);
+    var inferredType = inferrer.inferPropertyGet(this, variable.initializer,
+        fileOffset, _desugaredGet, typeContext, true,
+        receiverVariable: variable);
+    body.staticType = inferredType;
+    return inferredType;
   }
 }