Revert 'Fix a typo 'iff' => 'if''. iff is an abreviation of if and only if. See: http://en.wikipedia.org/wiki/If_and_only_if Commit 164767

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164768 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/bugpoint/CrashDebugger.cpp b/tools/bugpoint/CrashDebugger.cpp
index 8129b2b..aed16f4 100644
--- a/tools/bugpoint/CrashDebugger.cpp
+++ b/tools/bugpoint/CrashDebugger.cpp
@@ -48,7 +48,7 @@
   public:
     ReducePassList(BugDriver &bd) : BD(bd) {}
 
-    // doTest - Return true if running the "removed" passes succeeds, and
+    // doTest - Return true iff running the "removed" passes succeeds, and
     // running the "Kept" passes fail when run on the output of the "removed"
     // passes.  If we return true, we update the current module of bugpoint.
     //