Early draft of strict mode

src/ast.h

Index: src/ast.h
diff --git a/src/ast.h b/src/ast.h
index ba422fdaf38dbfadc51dd55559525b5571375059..878cc4c4e9129c0e4423b4a56978d037f84444f9 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -1672,7 +1672,8 @@ class FunctionLiteral: public Expression {
                   int start_position,
                   int end_position,
                   bool is_expression,
-                  bool contains_loops)
+                  bool contains_loops,
+                  bool strict_mode)
       : name_(name),
         scope_(scope),
         body_(body),
@@ -1686,6 +1687,7 @@ class FunctionLiteral: public Expression {
         end_position_(end_position),
         is_expression_(is_expression),
         contains_loops_(contains_loops),
+        strict_mode_(strict_mode),
         function_token_position_(RelocInfo::kNoPosition),
         inferred_name_(Heap::empty_string()),
         try_full_codegen_(false),
@@ -1702,6 +1704,7 @@ class FunctionLiteral: public Expression {
   int end_position() const { return end_position_; }
   bool is_expression() const { return is_expression_; }
   bool contains_loops() const { return contains_loops_; }
+  bool strict_mode() const { return strict_mode_; }
 
   int materialized_literal_count() { return materialized_literal_count_; }
   int expected_property_count() { return expected_property_count_; }
@@ -1745,6 +1748,7 @@ class FunctionLiteral: public Expression {
   int end_position_;
   bool is_expression_;
   bool contains_loops_;
+  bool strict_mode_;
   int function_token_position_;
   Handle<String> inferred_name_;
   bool try_full_codegen_;