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

lib/Transforms/Instrumentation/PathProfiling.cpp

@@ -469,7 +469,7 @@ void BLInstrumentationEdge::setIncrement(long increment) {
   _increment = increment;
 }
 
-// True if the edge has already been instrumented.
+// True iff the edge has already been instrumented.
 bool BLInstrumentationEdge::hasInstrumentation() {
   return(_hasInstrumentation);
 }