Remove funky 2-stage initialization of ParserInfo and an adventurous memset.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 867bcf9c6bfdecca2659d7094368af7cbd8c399b..fdd28ea32db7325b1b69316972bce4a8c736ec9a 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -7848,8 +7848,7 @@ bool HOptimizedGraphBuilder::TryInline(Handle<JSFunction> target,
   // Parse and allocate variables.
   // Use the same AstValueFactory for creating strings in the sub-compilation
   // step, but don't transfer ownership to target_info.
-  ParseInfo parse_info(zone());
-  parse_info.InitializeFromJSFunction(target);
+  ParseInfo parse_info(zone(), target);
   parse_info.set_ast_value_factory(
       top_info()->parse_info()->ast_value_factory());
   parse_info.set_ast_value_factory_owned(false);