Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/Support/Unicode.h b/linux-x64/clang/include/llvm/Support/Unicode.h
index 815484f..983acaf 100644
--- a/linux-x64/clang/include/llvm/Support/Unicode.h
+++ b/linux-x64/clang/include/llvm/Support/Unicode.h
@@ -60,7 +60,7 @@
 ///   * 1 for each of the remaining characters.
 int columnWidthUTF8(StringRef Text);
 
-/// Fold input unicode character according the the Simple unicode case folding
+/// Fold input unicode character according the Simple unicode case folding
 /// rules.
 int foldCharSimple(int C);