[MIPS] Use generic STABS_DEBUG macro.

  /* This is the MIPS specific mdebug section.  */

  .mdebug : { *(.mdebug) }

  /* These are needed for ELF backends which have not yet been

     converted to the new style linker.  */

  .stab 0 : { *(.stab) }

  .stabstr 0 : { *(.stabstr) }

  STABS_DEBUG

  DWARF_DEBUG

  /* These must appear regardless of  .  */

  .gptab.sdata : { *(.gptab.data) *(.gptab.sdata) }

  .gptab.sbss : { *(.gptab.bss) *(.gptab.sbss) }

  .comment : { *(.comment) }

  .note : { *(.note) }

}