sparc.opt (mfix-ut700): New option.

sparc.opt (mfix-ut700): New option.

	* config/sparc/sparc.opt (mfix-ut700): New option.
	(mfix-gr712rc): Likewise.
	(sparc_fix_b2bst): New variable.
	* doc/invoke.texi (SPARC options): Document them.
	(ARM options): Fix warnings.
	* config/sparc/sparc.c (sparc_do_work_around_errata): Insert NOP
	instructions to prevent sequences that can trigger the store-store
	errata for certain LEON3FT processors.
	(pass_work_around_errata::gate): Also test sparc_fix_b2bst.
	(sparc_option_override): Set sparc_fix_b2bst appropriately.
	* config/sparc/sparc.md (fix_b2bst): New attribute.
	(in_branch_delay): Prevent stores in delay slot if fix_b2bst.

From-SVN: r250114