* doc/implement-c.texi: Document C11 implementation-defined
	behavior.  Refer to -ffp-contract=fast for contraction behavior.
	* doc/invoke.texi (-std=c99, std=c11): Update description of
	completeness.
	(-std=gnu99): Don't mention as future default.
	(-std=gnu11): Mention as intended future default.
	* doc/standards.texi: Update descriptions of C99 and C11 support.
	Limit statement about C99 facilities for freestanding
	implementations to some platforms only.

From-SVN: r205505