libstdc++: Fix reversed args in unreachable assumption [PR109849]

libstdc++-v3/ChangeLog:

	PR libstdc++/109849
	* include/bits/vector.tcc (vector::_M_range_insert): Fix
	reversed args in length calculation.

diff --git a/libstdc++-v3/include/bits/vector.tcc b/libstdc++-v3/include/bits/vector.tcc
index 44920a0549abe7c355f496c476dcd86c3a036ed1..4f4c366080bea216252f49b9c3a29231fce60feb 100644 (file)
--- a/libstdc++-v3/include/bits/vector.tcc
+++ b/libstdc++-v3/include/bits/vector.tcc
@@ -934,7 +934,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
                const size_type __len =
                  _M_check_len(__n, "vector::_M_range_insert");
 #if __cplusplus < 201103L
-               if (__len < (__n + (__old_start - __old_finish)))
+               if (__len < (__n + (__old_finish - __old_start)))
                  __builtin_unreachable();
 #endif