[SH] PR 50751 - add HImode displacement addressing support

[Oleg Endo]

Hello,

The attached patch adds HImode addressing support.
Tested against rev. 186243 with
sudo make -k check RUNTESTFLAGS="--target_board=sh-sim
\{-m2/-ml,-m2/-mb,-m2a/-mb,-m2a-single/-mb,-m4/-ml,-m4/-mb,
-m4-single/-ml,-m4-single/-mb,-m4a-single/-ml,-m4a-single/-mb}"

and no new failures.
Test cases will follow soon.

Cheers,
Oleg

ChangeLog:

	PR target/50751
	* config/sh/sh-protos.h (sh_legitimate_index_p): Add
	new arguments consider_sh2a and allow_zero.
	* config/sh/sh.c (sh_legitimate_index_p): Likewise.
	(disp_addr_displacement): New function.
	(sh_address_cost): Use disp_addr_displacement function instead
	of DISP_ADDR_OFFSET.
	(sh_legitimate_address_p): Adapt to changed
	sh_legitimate_index_p declaration.
	(sh_find_mov_disp_adjust): Remove HImode check.
	(sh_secondary_reload): Add HImode case.  Use 
	satisfies_constraint_Sdd, disp_addr_displacement and
	max_mov_insn_displacement.
	(max_mov_insn_displacement): Remove HImode check.
	* config/sh/sh.h (CONST_OK_FOR_K04, CONST_OK_FOR_K12, 
	DISP_ADDR_P, DISP_ADDR_OFFSET): Remove.
	* config/sh/constraints.md (K05, K13): New constraints.
	(K12): Correct comment.
	(Sdd): Do not use DISP_ADDR_P macro.
	(Snd): Use satisfies_constraint_Sdd.
	(Sbw): Likewise.
	* config/sh/sh.md (extendhisi2): Remove constraints from 	
	expander.
	(*extendhisi2_compact, movhi_i): Remove.
	(*extendhisi2_compact_reg, *extendhisi2_compact_mem_disp,
	*extendhisi2_compact_mem_disp, *extendhisi2_compact_snd,
	*movhi_reg_reg, *movhi_store_mem_disp05,
	*movhi_store_mem_disp13, *movhi_load_mem_disp, 
	*movhi_load_mem_disp, *movhi): New insns.
	(*extendqisi2_compact_mem_disp, *extendqisi2_compact_mem_disp,
	*movqi_store_mem_disp04, *movqi_store_mem_disp12,
	*movqi_load_mem_disp, *movqi_load_mem_disp): Use 
	sh_legitimate_index_p instead of CONST_OK_FOR_Kxx.
	Add new peepholes for HImode displacement addressing.
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