Fix a typo 'iff' => 'if'

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164767 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/Statistic.cpp b/lib/Support/Statistic.cpp
index d8a6ad3..3e2a183 100644
--- a/lib/Support/Statistic.cpp
+++ b/lib/Support/Statistic.cpp
@@ -96,7 +96,7 @@
 
 }
 
-// Print information when destroyed, iff command line option is specified.
+// Print information when destroyed, if command line option is specified.
 StatisticInfo::~StatisticInfo() {
   llvm::PrintStatistics();
 }