as: Loc_mark_labels

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1 7.56 '.loc_mark_labels ENABLE'
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1 When emitting DWARF2 line number information, the '.loc_mark_labels'
1 directive makes the assembler emit an entry to the '.debug_line' line
1 number matrix with the 'basic_block' register in the state machine set
1 whenever a code label is seen.  The ENABLE argument should be either 1
1 or 0, to enable or disable this function respectively.
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