Fix a typo 'iff' => 'if'

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@164766 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGRTTI.cpp b/lib/CodeGen/CGRTTI.cpp
index e46423b..ee1a770 100644
--- a/lib/CodeGen/CGRTTI.cpp
+++ b/lib/CodeGen/CGRTTI.cpp
@@ -347,7 +347,7 @@
 
 // CanUseSingleInheritance - Return whether the given record decl has a "single, 
 // public, non-virtual base at offset zero (i.e. the derived class is dynamic 
-// iff the base is)", according to Itanium C++ ABI, 2.95p6b.
+// if the base is)", according to Itanium C++ ABI, 2.95p6b.
 static bool CanUseSingleInheritance(const CXXRecordDecl *RD) {
   // Check the number of bases.
   if (RD->getNumBases() != 1)
@@ -364,7 +364,7 @@
   if (Base->getAccessSpecifier() != AS_public)
     return false;
   
-  // Check that the class is dynamic iff the base is.
+  // Check that the class is dynamic if the base is.
   const CXXRecordDecl *BaseDecl = 
     cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl());
   if (!BaseDecl->isEmpty() &&