re PR target/33755 (Gcc 4.2.2 broken for mips linux kernel builds)

re PR target/33755 (Gcc 4.2.2 broken for mips linux kernel builds)

gcc/
	PR target/33755
	* config/mips/mips.c (mips_lo_sum_offset): New structure.
	(mips_hash_base, mips_lo_sum_offset_hash, mips_lo_sum_offset_eq)
	(mips_lo_sum_offset_lookup, mips_record_lo_sum)
	(mips_orphaned_high_part_p: New functions.
	(mips_avoid_hazard): Don't check INSN_P here.
	(mips_avoid_hazards): Rename to...
	(mips_reorg_process_insns): ...this.  Cope with
	!TARGET_EXPLICIT_RELOCS.  Delete orphaned high-part relocations,
	or turn them into nops.
	(mips_reorg): Remove TARGET_EXPLICIT_RELOCS check from calls to
	dbr_schedule and mips_avoid_hazards/mips_reorg_process_insns.
	(mips_set_mips16_mode): Don't set flag_delayed_branch here.
	(mips_override_options): Set flag_delayed_branch to 0.

gcc/testsuite/
	PR target/33755
	* gcc.target/mips/pr33755.c: New test.

From-SVN: r129606