Update Clang for 3.5 rebase (r209713).

Change-Id: I8c9133b0f8f776dc915f270b60f94962e771bc83
diff --git a/lib/Frontend/InitHeaderSearch.cpp b/lib/Frontend/InitHeaderSearch.cpp
index 34c01b4..d2890f0 100644
--- a/lib/Frontend/InitHeaderSearch.cpp
+++ b/lib/Frontend/InitHeaderSearch.cpp
@@ -379,6 +379,7 @@
                                   "arm-apple-darwin10", "v6", "", triple);
       break;
 
+    case llvm::Triple::aarch64:
     case llvm::Triple::arm64:
       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
                                   "arm64-apple-darwin10", "", "", triple);