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PR rtl-optimization/36419 * dwarf2out.c (barrier_args_size): New variable. (compute_barrier_args_size, compute_barrier_args_size_1): New functions. (dwarf2out_stack_adjust): For BARRIERs call compute_barrier_args_size if not called yet in the current function, use barrier_args_size array to find the new args_size value. (dwarf2out_frame_debug): Free and clear barrier_args_size. * g++.dg/eh/async-unwind2.C: New test. From-SVN: r138427
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