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PR tree-optimization/50693 * tree-cfg.c (gimple_can_merge_blocks_p): Allow merging with non-forced user labels. (gimple_merge_blocks): Turn non-forced user labels into debug bind stmt with the label as first operand and reset value. (gimple_duplicate_bb): Don't duplicate label debug stmts. * dwarf2out.c (gen_label_die): Handle NOTE_INSN_DELETED_DEBUG_LABEL. * final.c (final_scan_insn): Likewise. (rest_of_clean_state): Don't dump NOTE_INSN_DELETED_DEBUG_LABEL. * var-tracking.c (debug_label_num): New variable. (delete_debug_insns): Don't delete DEBUG_INSNs for LABEL_DECLs, instead turn them into NOTE_INSN_DELETED_DEBUG_LABEL notes. * cfglayout.c (skip_insns_after_block, duplicate_insn_chain): Handle NOTE_INSN_DELETED_DEBUG_LABEL. (duplicate_insn_chain): Don't duplicate LABEL_DECL DEBUG_INSNs. * insn-notes.def (DELETED_DEBUG_LABEL): New note kind. * print-rtl.c (print_rtx): Handle NOTE_INSN_DELETED_DEBUG_LABEL. * gengtype.c (adjust_field_rtx_def): Likewise. * config/i386/i386.c (ix86_output_function_epilogue): For MachO clear CODE_LABEL_NUMBER of NOTE_INSN_DELETED_DEBUG_LABEL if their are at the end of function and nop hasn't been emitted. * config/rs6000/rs6000.c (rs6000_output_function_epilogue): Likewise. From-SVN: r181014
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