Various clean-ups after top-level lexical declarations are done.

src/preparser.h

Index: src/preparser.h
diff --git a/src/preparser.h b/src/preparser.h
index 7c9791fc9ca25223983afbfee8f4f666c709af24..9b98f147a564fd69bed1521fada945ba994c1df9 100644
--- a/src/preparser.h
+++ b/src/preparser.h
@@ -1434,7 +1434,7 @@ class PreParser : public ParserBase<PreParserTraits> {
   // captured the syntax error), and false if a stack-overflow happened
   // during parsing.
   PreParseResult PreParseProgram() {
-    PreParserScope scope(scope_, GLOBAL_SCOPE);
+    PreParserScope scope(scope_, SCRIPT_SCOPE);
     PreParserFactory factory(NULL);
     FunctionState top_scope(&function_state_, &scope_, &scope, &factory);
     bool ok = true;