Mark ostream_iterator's constructors as noexcept.

llvm-svn: 284021
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 853042cf896a000af6d53a6788309844cb0ee84d
diff --git a/include/iterator b/include/iterator
index 188a480..b0f5527 100644
--- a/include/iterator
+++ b/include/iterator
@@ -889,9 +889,9 @@
     ostream_type* __out_stream_;
     const char_type* __delim_;
 public:
-    _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s)
+    _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s) _NOEXCEPT
         : __out_stream_(_VSTD::addressof(__s)), __delim_(0) {}
-    _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s, const _CharT* __delimiter)
+    _LIBCPP_INLINE_VISIBILITY ostream_iterator(ostream_type& __s, const _CharT* __delimiter) _NOEXCEPT
         : __out_stream_(_VSTD::addressof(__s)), __delim_(__delimiter) {}
     _LIBCPP_INLINE_VISIBILITY ostream_iterator& operator=(const _Tp& __value_)
         {