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

test/cctest/compiler/test-loop-assignment-analysis.cc

Index: test/cctest/compiler/test-loop-assignment-analysis.cc
diff --git a/test/cctest/compiler/test-loop-assignment-analysis.cc b/test/cctest/compiler/test-loop-assignment-analysis.cc
index 8da950e712df5bda6afeaa4677598236a0adf958..5f9820c72a6c2323af0477d45e125d460c927055 100644
--- a/test/cctest/compiler/test-loop-assignment-analysis.cc
+++ b/test/cctest/compiler/test-loop-assignment-analysis.cc
@@ -29,8 +29,7 @@ struct TestHelper : public HandleAndZoneScope {
 
   void CheckLoopAssignedCount(int expected, const char* var_name) {
     // TODO(titzer): don't scope analyze every single time.
-    ParseInfo parse_info(main_zone());
-    parse_info.InitializeFromJSFunction(function);
+    ParseInfo parse_info(main_zone(), function);
     CompilationInfo info(&parse_info);
 
     CHECK(Parser::ParseStatic(&parse_info));