Allow replacement of %% with %


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36044 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/lib/llvm.exp b/test/lib/llvm.exp
index ab7c994..160a784 100644
--- a/test/lib/llvm.exp
+++ b/test/lib/llvm.exp
@@ -68,6 +68,8 @@
   regsub -all {%s} $new_line $test new_line
   #replace %t with temp filenames
   regsub -all {%t} $new_line [file join Output $tmpFile] new_line
+  #replace %% with %
+  regsub -all {%%} $new_line % new_line
   return $new_line
 }