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

tools/parser-shell.cc

Index: tools/parser-shell.cc
diff --git a/tools/parser-shell.cc b/tools/parser-shell.cc
index 5f2a8034e80fa024ee39eb5c6b5afaf6d24b164a..3fe735986b2d1f006e282edd6d8952732e633593 100644
--- a/tools/parser-shell.cc
+++ b/tools/parser-shell.cc
@@ -89,8 +89,7 @@ std::pair<v8::base::TimeDelta, v8::base::TimeDelta> RunBaselineParser(
   // First round of parsing (produce data to cache).
   {
     Zone zone;
-    ParseInfo info(&zone);
-    info.InitializeFromScript(script);
+    ParseInfo info(&zone, script);
     info.set_global();
     info.set_cached_data(&cached_data_impl);
     info.set_compile_options(v8::ScriptCompiler::kProduceParserCache);
@@ -108,8 +107,7 @@ std::pair<v8::base::TimeDelta, v8::base::TimeDelta> RunBaselineParser(
   // Second round of parsing (consume cached data).
   {
     Zone zone;
-    ParseInfo info(&zone);
-    info.InitializeFromScript(script);
+    ParseInfo info(&zone, script);
     info.set_global();
     info.set_cached_data(&cached_data_impl);
     info.set_compile_options(v8::ScriptCompiler::kConsumeParserCache);