re PR target/50725 (-O3 -mstackrealign -march=core2 generates invalid prologue code in callee procedure)

	PR target/50725
	* function.c (thread_prologue_and_epilogue_insns): If
	stack_realign_drap, add drap_reg to SET_UP_BY_PROLOGUE
	regset.

	* gcc.target/i386/pr50725.c: New test.

From-SVN: r181860