sparc.c (eligible_for_epilogue_delay): Don't put assignments from FP constants sonce 'Y' output code can't handle it.

	* config/sparc/sparc.c (eligible_for_epilogue_delay): Don't put
	assignments from FP constants sonce 'Y' output code can't handle it.
	(eligible_for_sibcall_delay): Likewise.

From-SVN: r39854