[Isolates] Merge from bleeding_edge to isolates, revisions 6100-6300.

src/string-search.h

Index: src/string-search.h
===================================================================
--- src/string-search.h	(revision 6941)
+++ src/string-search.h	(working copy)
@@ -66,12 +66,7 @@
   }
 
   static inline bool IsAsciiString(Vector<const uc16> string) {
-    for (int i = 0, n = string.length(); i < n; i++) {
-      if (static_cast<unsigned>(string[i]) > String::kMaxAsciiCharCodeU) {
-        return false;
-      }
-    }
-    return true;
+    return String::IsAscii(string.start(), string.length());
   }
 
   friend class Isolate;