Source position tests for switch and try catch finally

runtime/vm/ast_transformer.cc

Index: runtime/vm/ast_transformer.cc
diff --git a/runtime/vm/ast_transformer.cc b/runtime/vm/ast_transformer.cc
index ae42b7089427b044851036e7351046b8e8b97a2a..32ec3f9f1d1bc00525ab8a33eb5991df84d35e85 100644
--- a/runtime/vm/ast_transformer.cc
+++ b/runtime/vm/ast_transformer.cc
@@ -119,6 +119,7 @@ void AwaitTransformer::VisitAwaitNode(AwaitNode* node) {
   //   :saved_try_ctx_var = :await_saved_try_ctx_var_y;
   //   :await_temp_var_(X+1) = :result_param;
 
+  const intptr_t token_pos = node->token_pos();
   LocalVariable* async_op = GetVariableInScope(
       preamble_->scope(), Symbols::AsyncOperation());
   LocalVariable* async_then_callback = GetVariableInScope(
@@ -136,7 +137,7 @@ void AwaitTransformer::VisitAwaitNode(AwaitNode* node) {
   LocalVariable* await_temp = AddToPreambleNewTempVar(transformed_expr);
 
   AwaitMarkerNode* await_marker =
-      new (Z) AwaitMarkerNode(async_temp_scope_, node->scope());
+      new (Z) AwaitMarkerNode(async_temp_scope_, node->scope(), token_pos);
   preamble_->Add(await_marker);
 
   // :result_param = _awaitHelper(