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/lib/Target/ARM/ARMFastISel.cpp b/lib/Target/ARM/ARMFastISel.cpp
index 1458e33..8933a02 100644
--- a/lib/Target/ARM/ARMFastISel.cpp
+++ b/lib/Target/ARM/ARMFastISel.cpp
@@ -276,7 +276,7 @@
   if (TII.isPredicable(MI) || isARMNEONPred(MI))
     AddDefaultPred(MIB);
 
-  // Do we optionally set a predicate?  Preds is size > 0 if the predicate
+  // Do we optionally set a predicate?  Preds is size > 0 iff the predicate
   // defines CPSR. All other OptionalDefines in ARM are the CCR register.
   bool CPSR = false;
   if (DefinesOptionalPredicate(MI, &CPSR)) {