Fix for issue 27199

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

Index: pkg/compiler/lib/src/ssa/nodes.dart
diff --git a/pkg/compiler/lib/src/ssa/nodes.dart b/pkg/compiler/lib/src/ssa/nodes.dart
index 929cb7751ad05f1bbb47dc5720e1a3a9339d8eee..b7da02f0aa2ffa176981c96e46b40332bf19a3b2 100644
--- a/pkg/compiler/lib/src/ssa/nodes.dart
+++ b/pkg/compiler/lib/src/ssa/nodes.dart
@@ -3239,6 +3239,8 @@ class HTypeInfoReadVariable extends HInstruction {
   bool dataEquals(HTypeInfoReadVariable other) {
     return variable.element == other.variable.element;
   }
+
+  String toString() => 'HTypeInfoReadVariable($variable)';
 }
 
 enum TypeInfoExpressionKind { COMPLETE, INSTANCE }