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 164766

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@164769 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/TextDiagnostic.cpp b/lib/Frontend/TextDiagnostic.cpp
index d872e42..a8a5613 100644
--- a/lib/Frontend/TextDiagnostic.cpp
+++ b/lib/Frontend/TextDiagnostic.cpp
@@ -88,7 +88,7 @@
 /// \param SourceLine The line of source
 /// \param i Pointer to byte index,
 /// \param TabStop used to expand tabs
-/// \return pair(printable text, 'true' if original text was printable)
+/// \return pair(printable text, 'true' iff original text was printable)
 ///
 static std::pair<SmallString<16>, bool>
 printableTextForNextCharacter(StringRef SourceLine, size_t *i,