Fix optimization of Unicode regexp with ASCII subject to respect repeat counts.

src/jsregexp.cc

Index: src/jsregexp.cc
===================================================================
--- src/jsregexp.cc	(revision 11751)
+++ src/jsregexp.cc	(working copy)
@@ -2754,6 +2754,15 @@
   if (info()->visited) return this;
   VisitMarker marker(info());
   int choice_count = alternatives_->length();
+
+  for (int i = 0; i < choice_count; i++) {
+    GuardedAlternative alternative = alternatives_->at(i);
+    if (alternative.guards() != NULL && alternative.guards()->length() != 0) {
+      set_replacement(this);
+      return this;
+    }
+  }
+      
   int surviving = 0;
   RegExpNode* survivor = NULL;
   for (int i = 0; i < choice_count; i++) {