Add parser support for generators.

src/preparser.h

Index: src/preparser.h
diff --git a/src/preparser.h b/src/preparser.h
index ad52d74bbd8082cb3f4c4a4e390f6fc7aa0ee7ab..1df792fd7b33c361a01e64015e7f67ce0566e4b6 100644
--- a/src/preparser.h
+++ b/src/preparser.h
@@ -240,9 +240,13 @@ class PreParser {
     static Identifier FutureStrictReserved()  {
       return Identifier(kFutureStrictReservedIdentifier);
     }
+    static Identifier Yield()  {
+      return Identifier(kFutureStrictReservedIdentifier);
+    }
     bool IsEval() { return type_ == kEvalIdentifier; }
     bool IsArguments() { return type_ == kArgumentsIdentifier; }
     bool IsEvalOrArguments() { return type_ >= kEvalIdentifier; }
+    bool IsYield() { return type_ == kYieldIdentifier; }
     bool IsFutureReserved() { return type_ == kFutureReservedIdentifier; }
     bool IsFutureStrictReserved() {
       return type_ == kFutureStrictReservedIdentifier;
@@ -254,6 +258,7 @@ class PreParser {
       kUnknownIdentifier,
       kFutureReservedIdentifier,
       kFutureStrictReservedIdentifier,
+      kYieldIdentifier,
       kEvalIdentifier,
       kArgumentsIdentifier
     };
@@ -451,7 +456,8 @@ class PreParser {
           expected_properties_(0),
           with_nesting_count_(0),
           language_mode_(
-              (prev_ != NULL) ? prev_->language_mode() : i::CLASSIC_MODE) {
+              (prev_ != NULL) ? prev_->language_mode() : i::CLASSIC_MODE),
+          is_generator_(false) {
       *variable = this;
     }
     ~Scope() { *variable_ = prev_; }
@@ -461,6 +467,8 @@ class PreParser {
     int expected_properties() { return expected_properties_; }
     int materialized_literal_count() { return materialized_literal_count_; }
     bool IsInsideWith() { return with_nesting_count_ != 0; }
+    bool is_generator() { return is_generator_; }
+    void set_is_generator(bool is_generator) { is_generator_ = is_generator; }
     bool is_classic_mode() {
       return language_mode_ == i::CLASSIC_MODE;
     }
@@ -492,6 +500,7 @@ class PreParser {
     int expected_properties_;
     int with_nesting_count_;
     i::LanguageMode language_mode_;
+    bool is_generator_;
   };
 
   // Preparse the program. Only called in PreParseProgram after creating