Somehow search_n never got tested, so of course it had a bug in it.  This fixes http://llvm.org/bugs/show_bug.cgi?id=15667.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@178764 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/algorithm b/include/algorithm
index 4adcc69..39191db 100644
--- a/include/algorithm
+++ b/include/algorithm
@@ -1398,7 +1398,7 @@
         // Find first element in sequence that matchs __value_, with a mininum of loop checks
         while (true)
         {
-            if (__first == __s)  // return __last if no element matches __value_
+            if (__first >= __s)  // return __last if no element matches __value_
                 return __last;
             if (__pred(*__first, __value_))
                 break;