Cleanup: use const reference for ParsedFunction where possible.

runtime/vm/ast_transformer.cc

Index: runtime/vm/ast_transformer.cc
===================================================================
--- runtime/vm/ast_transformer.cc	(revision 43213)
+++ runtime/vm/ast_transformer.cc	(working copy)
@@ -45,7 +45,7 @@
 #undef DEFINE_UNREACHABLE
 
 AwaitTransformer::AwaitTransformer(SequenceNode* preamble,
-                                   ParsedFunction* const parsed_function,
+                                   const ParsedFunction& parsed_function,
                                    LocalScope* function_top)
     : preamble_(preamble),
       temp_cnt_(0),
@@ -212,13 +212,13 @@
   // If this expression is part of a try block, also append the code for
   // restoring the saved try context that lives on the stack.
   const String& async_saved_try_ctx_name =
-      String::Handle(Z, parsed_function_->async_saved_try_ctx_name());
+      String::Handle(Z, parsed_function_.async_saved_try_ctx_name());
   if (!async_saved_try_ctx_name.IsNull()) {
     LocalVariable* async_saved_try_ctx =
         GetVariableInScope(preamble_->scope(), async_saved_try_ctx_name);
     preamble_->Add(new (Z) StoreLocalNode(
         Scanner::kNoSourcePos,
-        parsed_function_->saved_try_ctx(),
+        parsed_function_.saved_try_ctx(),
         new (Z) LoadLocalNode(Scanner::kNoSourcePos, async_saved_try_ctx)));
   }