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PR rtl-optimization/36419 * combine-stack-adj.c (adjust_frame_related_expr): New function. (combine_stack_adjustments_for_block): Call it if needed. Delete correct insn. * dwarf2out.c (dwarf2out_frame_debug_expr): Adjust DW_CFA_GNU_args_size if CSA pass merged some adjustments into prologue sp adjustment. * g++.dg/eh/async-unwind1.C: New test. From-SVN: r137689
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