re PR target/50814 (SH Target: SHAD / SHLD instructions not used on SH2A)

	PR target/50814.
	* config/sh/sh.c (expand_ashiftrt): Handle TARGET_SH2A same as
	TARGET_SH3.
	(shl_sext_kind): Likewise.
	* config/sh/sh.h (SH_DYNAMIC_SHIFT_COST): Likewise.
	* config/sh/sh.md (ashlsi3_sh2a, ashrsi3_sh2a, lshrsi3_sh2a):
	Remove.
	(ashlsi3_std): Handle TARGET_SH2A same as TARGET_SH3.
	(ashlsi3): Likewise.
	(ashrsi3_d): Likewise.
	(lshrsi3_d): Likewise.
	(lshrsi3): Likewise.

From-SVN: r181896