re PR target/52898 (SH Target: Inefficient DImode comparisons)

re PR target/52898 (SH Target: Inefficient DImode comparisons)

	PR target/52898
	PR target/51697
	* common/config/sh/sh-common.c (sh_option_optimization_table): Remove
	OPT_mcbranchdi entry.
	* config/sh/sh.opt (mcbranchdi, mcmpeqdi): Mark as undocumented and
	emit a warning.
	* config/sh/sh.c (sh_option_override): Initialize TARGET_CBRANCHDI4
	and TARGET_CMPEQDI_T variables.
	* doc/invoke.texi (SH options): Undocument -mcbranchdi and -mcmpeqdi.

	PR target/52898
	PR target/51697
	* gcc.target/sh/pr51697.c: New.

From-SVN: r205794