i386.c (ix86_builtin_reciprocal): Remove dependency on TARGET_RECIP.

	* config/i386/i386.c (ix86_builtin_reciprocal): Remove dependency
	on TARGET_RECIP.
	* doc/invoke.texi (-mrecip): Clarify that we don't need -mrecip
	for 1/sqrtf.

From-SVN: r153940