[libstdc++] Remove unused hasher instance.

This is a remnant of poorly executed refactoring.

libstdc++-v3/ChangeLog:

	* include/std/barrier (__tree_barrier::_M_arrive): Remove
	unnecessary hasher instantiation.

diff --git a/libstdc++-v3/include/std/barrier b/libstdc++-v3/include/std/barrier
index fd61fb4..4210e30 100644 (file)
--- a/libstdc++-v3/include/std/barrier
+++ b/libstdc++-v3/include/std/barrier
@@ -103,7 +103,6 @@ It looks different from literature pseudocode for two main reasons:
                           static_cast<__barrier_phase_t>(__old_phase_val + 2);
 
        size_t __current_expected = _M_expected;
-       std::hash<std::thread::id> __hasher;
        __current %= ((_M_expected + 1) >> 1);
 
        for (int __round = 0; ; ++__round)