Dart VM: Fix an order-of-evaluation bug in async code.

runtime/vm/ast_transformer.h

Index: runtime/vm/ast_transformer.h
diff --git a/runtime/vm/ast_transformer.h b/runtime/vm/ast_transformer.h
index 5930f41159b5979d473ece2b1befc703c784a22d..e189afddf950af03312716411e30c355558612d6 100644
--- a/runtime/vm/ast_transformer.h
+++ b/runtime/vm/ast_transformer.h
@@ -51,8 +51,9 @@ class AwaitTransformer : public AstNodeVisitor {
 
  private:
   LocalVariable* EnsureCurrentTempVar();
-  LocalVariable* AddToPreambleNewTempVar(AstNode* node,
+  LocalVariable* AddNewTempVarToPreamble(AstNode* node,
                                          TokenPosition token_pos);
+  LoadLocalNode* MakeName(AstNode* node);
   ArgumentListNode* TransformArguments(ArgumentListNode* node);
   AstNode* LazyTransform(const Token::Kind kind,
                          AstNode* new_left,