Mark __clear_and_shrink() as noexcept. This prevents the generation of a catch block and call to terminate in string's move assignment. Thanks to Howard for the 'catch'.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@333435 91177308-0d34-0410-b5e6-96231b3b80d8

include/string

@@ -1259,7 +1259,7 @@ public:
 
     _LIBCPP_INLINE_VISIBILITY bool __invariants() const;
 
-    _LIBCPP_INLINE_VISIBILITY void __clear_and_shrink();
+    _LIBCPP_INLINE_VISIBILITY void __clear_and_shrink() _NOEXCEPT;
     
     _LIBCPP_INLINE_VISIBILITY
     bool __is_long() const _NOEXCEPT
@@ -3585,7 +3585,7 @@ basic_string<_CharT, _Traits, _Allocator>::__invariants() const
 template<class _CharT, class _Traits, class _Allocator>
 inline _LIBCPP_INLINE_VISIBILITY
 void 
-basic_string<_CharT, _Traits, _Allocator>::__clear_and_shrink()
+basic_string<_CharT, _Traits, _Allocator>::__clear_and_shrink() _NOEXCEPT
 {
     clear();
     if(__is_long())