PTH: Fix termination condition in binary search.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@62277 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/PTHLexer.cpp b/lib/Lex/PTHLexer.cpp
index a2d66fe..19ff494 100644
--- a/lib/Lex/PTHLexer.cpp
+++ b/lib/Lex/PTHLexer.cpp
@@ -656,7 +656,7 @@
     max = i;
     assert(!(max == min) || (min == i));
   }
-  while (1);
+  while (min != max);
   
   return 0;
 }