Split function block scoping into a separate flag

src/preparser.h

Index: src/preparser.h
diff --git a/src/preparser.h b/src/preparser.h
index 7bf08458750b94ab76a738aab5347ba0bc402bf3..61cb883f8a664f8695ce78de9477b6bae6995f89 100644
--- a/src/preparser.h
+++ b/src/preparser.h
@@ -108,6 +108,7 @@ class ParserBase : public Traits {
         allow_natives_(false),
         allow_harmony_arrow_functions_(false),
         allow_harmony_sloppy_(false),
+        allow_harmony_sloppy_function_(false),
         allow_harmony_sloppy_let_(false),
         allow_harmony_rest_parameters_(false),
         allow_harmony_spreadcalls_(false),
@@ -125,6 +126,7 @@ class ParserBase : public Traits {
   ALLOW_ACCESSORS(natives);
   ALLOW_ACCESSORS(harmony_arrow_functions);
   ALLOW_ACCESSORS(harmony_sloppy);
+  ALLOW_ACCESSORS(harmony_sloppy_function);
   ALLOW_ACCESSORS(harmony_sloppy_let);
   ALLOW_ACCESSORS(harmony_rest_parameters);
   ALLOW_ACCESSORS(harmony_spreadcalls);
@@ -798,6 +800,7 @@ class ParserBase : public Traits {
   bool allow_natives_;
   bool allow_harmony_arrow_functions_;
   bool allow_harmony_sloppy_;
+  bool allow_harmony_sloppy_function_;
   bool allow_harmony_sloppy_let_;
   bool allow_harmony_rest_parameters_;
   bool allow_harmony_spreadcalls_;