[Patch i386] PR78509 - TARGET_C_EXCESS_PRECISION should not return

[Patch i386] PR78509 - TARGET_C_EXCESS_PRECISION should not return
 "unpredictable" for EXCESS_PRECISION_TYPE_STANDARD

gcc/

	PR target/78509
	* config/i386/i386.c (i386_excess_precision): Do not return
	FLT_EVAL_METHOD_UNPREDICTABLE when "type" is
	EXCESS_PRECISION_TYPE_STANDARD.
	* target.def (excess_precision): Document that targets should
	not return FLT_EVAL_METHOD_UNPREDICTABLE when "type" is
	EXCESS_PRECISION_TYPE_STANDARD or EXCESS_PRECISION_TYPE_FAST.
	Fix typo in first sentence.
	* doc/tm.texi: Regenerate.

From-SVN: r242866