[SH][committed] PR 53513 - Add __builtin_sh_get_fpscr, __builtin_sh_set_fpscr

[Oleg Endo]

Hi,

As discussed in the PR, this adds two new SH built-in functions
__builtin_sh_get_fpscr __builtin_sh_set_fpscr.  Tested on r216173 with  

make -k check RUNTESTFLAGS="--target_board=sh-sim\{-m4/-ml,-m4/-mb}"

and no new failures.  Committed as r216424.

Cheers,
Oleg

gcc/ChangeLog:
	PR target/53513
	* config/sh/sh-modes.def (PSI): Remove.
	* config/sh/sh-protos.h (get_fpscr_rtx): Remove.
	* config/sh/sh.c (fpscr_rtx, get_fpscr_rtx): Remove.
	(sh_reorg): Remove commented out FPSCR code.
	(fpscr_set_from_mem): Use SImode instead of PSImode.  Emit lds_fpscr
	insn instead of move insn.
	(sh_hard_regno_mode_ok): Return SImode for FPSCR.
	(sh_legitimate_address_p, sh_legitimize_reload_address): Remove PSImode
	handling.
	(sh_emit_mode_set): Emit lds_fpscr and sts_fpscr insns.
	(sh1_builtin_p): Uncomment.
	(SH_BLTIN_UV 25, SH_BLTIN_VU 26): New macros.
	(bdesc): Add __builtin_sh_get_fpscr and __builtin_sh_set_fpscr.
	* config/sh/sh/predicates.md (fpscr_operand): Simplify.
	(fpscr_movsrc_operand, fpscr_movdst_operand): New predicates.
	(general_movsrc_operand, general_movdst_operand): Disallow
	fpscr_operand.
	* config/sh/sh.md (FPSCR_FR): New constant.
	(push_fpscr): Emit sts_fpscr insn.
	(pop_fpscr): Emit lds_fpscr_insn.
	(movsi_ie): Disallow FPSCR operands.
	(fpu_switch, unnamed related split, extend_psi_si,
	truncate_si_psi): Remove insns.
	(lds_fpscr, sts_fpscr): New insns.
	(toggle_sz, toggle_pr): Use SImode for FPSCR_REG instead of PSImode.

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