Fix a typo 'iff' => 'if'

llvm-svn: 164766
diff --git a/clang/lib/CodeGen/CodeGenTBAA.cpp b/clang/lib/CodeGen/CodeGenTBAA.cpp
index bab60af..3d5725d 100644
--- a/clang/lib/CodeGen/CodeGenTBAA.cpp
+++ b/clang/lib/CodeGen/CodeGenTBAA.cpp
@@ -135,7 +135,7 @@
   // Enum types are distinct types. In C++ they have "underlying types",
   // however they aren't related for TBAA.
   if (const EnumType *ETy = dyn_cast<EnumType>(Ty)) {
-    // In C mode, two anonymous enums are compatible iff their members
+    // In C mode, two anonymous enums are compatible if their members
     // are the same -- see C99 6.2.7p1. For now, be conservative. We could
     // theoretically implement this by combining information about all the
     // members into a single identifying MDNode.