Add/fix/cleanup type inference for throw and rethrow.

pkg/front_end/lib/src/fasta/type_inference/type_inference_listener.dart

Index: pkg/front_end/lib/src/fasta/type_inference/type_inference_listener.dart
diff --git a/pkg/front_end/lib/src/fasta/type_inference/type_inference_listener.dart b/pkg/front_end/lib/src/fasta/type_inference/type_inference_listener.dart
index 197e16f663861f2dae6a7fea478efedf4bc99d43..2bce413f6258225a0caf4250be8a1e1cf3204da1 100644
--- a/pkg/front_end/lib/src/fasta/type_inference/type_inference_listener.dart
+++ b/pkg/front_end/lib/src/fasta/type_inference/type_inference_listener.dart
@@ -262,6 +262,12 @@ class TypeInferenceListener
   void redirectingInitializerExit(RedirectingInitializer initializer) =>
       debugInitializerExit("redirectingInitializer", initializer);
 
+  bool rethrowEnter(Rethrow expression, DartType typeContext) =>
+      debugExpressionEnter('rethrow', expression, typeContext);
+
+  void rethrowExit(Rethrow expression, DartType inferredType) =>
+      debugExpressionExit('rethrow', expression, inferredType);
+
   void returnStatementEnter(ReturnStatement statement) =>
       debugStatementEnter('returnStatement', statement);
 
@@ -302,6 +308,12 @@ class TypeInferenceListener
   void stringLiteralExit(StringLiteral expression, DartType inferredType) =>
       debugExpressionExit("StringLiteral", expression, inferredType);
 
+  bool throwEnter(Throw expression, DartType typeContext) =>
+      debugExpressionEnter('throw', expression, typeContext);
+
+  void throwExit(Throw expression, DartType inferredType) =>
+      debugExpressionExit('throw', expression, inferredType);
+
   bool variableAssignEnter(Expression expression, DartType typeContext) =>
       debugExpressionEnter("variableAssign", expression, typeContext);