Glen: Minor tweaks to locale.cpp to help it compile with exceptions turned off.

llvm-svn: 187332
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 55d5e76fdb56a7c66c76374c6daaff86f06db5c5
diff --git a/src/locale.cpp b/src/locale.cpp
index bf95732..6300ce1 100644
--- a/src/locale.cpp
+++ b/src/locale.cpp
@@ -18,9 +18,10 @@
 #include "codecvt"
 #include "vector"
 #include "algorithm"
-#include "algorithm"
 #include "typeinfo"
-#include "type_traits"
+#ifndef _LIBCPP_NO_EXCEPTIONS
+#  include "type_traits"
+#endif
 #include "clocale"
 #include "cstring"
 #include "cwctype"