Don't serialize local variables.

pkg/analyzer/lib/src/summary/idl.dart

Index: pkg/analyzer/lib/src/summary/idl.dart
diff --git a/pkg/analyzer/lib/src/summary/idl.dart b/pkg/analyzer/lib/src/summary/idl.dart
index 1f68ec5c105915319efc208d076cd05d187b1c29..c4d7b6d8282c0266fc6768098f0cb75fd69e1dc4 100644
--- a/pkg/analyzer/lib/src/summary/idl.dart
+++ b/pkg/analyzer/lib/src/summary/idl.dart
@@ -831,9 +831,7 @@ abstract class LinkedReference extends base.SummaryClass {
   /**
    * If [kind] is [ReferenceKind.function] (that is, the entity being referred
    * to is a local function), the index of the function within
-   * [UnlinkedExecutable.localFunctions].  If [kind] is
-   * [ReferenceKind.variable], the index of the variable within
-   * [UnlinkedExecutable.localVariables].  Otherwise zero.
+   * [UnlinkedExecutable.localFunctions].  Otherwise zero.
    */
   @Id(6)
   int get localIndex;
@@ -1802,6 +1800,7 @@ abstract class UnlinkedExecutable extends base.SummaryClass {
    * The list of local variables.
    */
   @informative
+  @deprecated
   @Id(19)
   List<UnlinkedVariable> get localVariables;