re PR fortran/92977 (ICE in gfc_trans_omp_atomic, at fortran/trans-openmp.c:3526)

re PR fortran/92977 (ICE in gfc_trans_omp_atomic, at fortran/trans-openmp.c:3526)

	PR fortran/92977
	* frontend-passes.c (in_omp_atomic): New variable.
	(cfe_expr_0, matmul_to_var_expr, matmul_temp_args,
	inline_matmul_assign, call_external_blas): Don't optimize in
	EXEC_OMP_ATOMIC.
	(optimize_namespace): Clear in_omp_atomic.
	(gfc_code_walker): Set in_omp_atomic for EXEC_OMP_ATOMIC, save/restore
	it around.

	* gfortran.dg/gomp/pr92977.f90: New test.

From-SVN: r279554