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* NEWS: Add item about discriminator support.
* dwarf2dbg.h (struct dwarf2_line_info): Add discriminator field.
* dwarf2dbg.c (current): Add discriminator field.
(dwarf2_where): Copy discriminator value.
(dwarf2_consume_line_info): Set discriminator to 0.
(dwarf2_directive_loc): Process discriminator sub-op.
(out_leb128): New function.
(process_entries): Output DW_LNE_set_discriminator.
* doc/as.texinfo: Add discriminator operand to .loc directive.
* testsuite/gas/lns/lns-common-1.d: Add test for discriminator.
* testsuite/gas/lns/lns-common-1.s: Likewise.