Fix PR32183 - Wrap GCC exception implementation in missing namespace std

llvm-svn: 297306

libcxx/src/support/runtime/exception_glibcxx.ipp

@@ -35,4 +35,4 @@ bad_typeid::bad_typeid() _NOEXCEPT
 {
 }
 
-} // namespace
+} // namespace std

libcxx/src/support/runtime/exception_pointer_glibcxx.ipp

@@ -17,6 +17,8 @@
 // stable ABI), and its rethrow_exception(std::__exception_ptr::exception_ptr)
 // function.
 
+namespace std {
+
 namespace __exception_ptr
 {
 
@@ -72,3 +74,5 @@ void rethrow_exception(exception_ptr p)
 {
     rethrow_exception(reinterpret_cast<__exception_ptr::exception_ptr&>(p));
 }
+
+} // namespace std