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PR middle-end/51038 libstdc++-v3 * include/bits/atomic_base.h (atomic_thread_fence): Call built-in. (atomic_signal_fence): Call built-in. (test_and_set, clear): Call new atomic built-ins. gcc * builtins.c (expand_builtin_atomic_clear): New. Expand atomic_clear. (expand_builtin_atomic_test_and_set): New. Expand atomic test_and_set. (expand_builtin): Add cases for test_and_set and clear. * sync-builtins.def (BUILT_IN_ATOMIC_TEST_AND_SET): New. (BUILT_IN_ATOMIC_CLEAR): New. testsuite * gcc.dg/atomic-invalid.c: Add test for invalid __atomic_clear models. * gcc.dg/atomic-flag.c: New. Test __atomic_test_and_set and __atomic_clear. From-SVN: r181271
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