Fix the local variable lookup in the locals handler.

pkg/compiler/lib/src/kernel/element_map.dart

Index: pkg/compiler/lib/src/kernel/element_map.dart
diff --git a/pkg/compiler/lib/src/kernel/element_map.dart b/pkg/compiler/lib/src/kernel/element_map.dart
index 9bad04ee9de5a80a1acafda382e328c4b7ed90de..f1fc72519504c4e22288173c50bd9ac565e9524e 100644
--- a/pkg/compiler/lib/src/kernel/element_map.dart
+++ b/pkg/compiler/lib/src/kernel/element_map.dart
@@ -383,8 +383,14 @@ abstract class KernelToLocalsMap {
   /// Call to notify that [member] is no longer being inlined.
   void leaveInlinedMember(covariant MemberEntity member);
 
-  /// Returns the [Local] for [node].
-  Local getLocalVariable(ir.VariableDeclaration node);
+  /// Returns the [Local] for [node]. If [isClosureCallMethod] is true, this
+  /// gives the locals map permission to also look one scope higher within the
+  /// class for the corresponding local. This can happen in the case of free
+  /// variables involved with a closure class.
+  // TODO(efortuna, johnniwinther): convey this information without a boolean
+  // parameter.
+  Local getLocalVariable(ir.VariableDeclaration node,
+      {bool isClosureCallMethod = false});
 
   /// Returns the [Local] corresponding to the [node]. The node must be either
   /// a [ir.FunctionDeclaration] or [ir.FunctionExpression].