PR target/68471
	PR target/68472
	* config/i386/i386.c (ix86_mitigate_rop): Don't call
	compute_bb_for_insn again.  Call df_insn_rescan_all.
	* config/i386/i386.md (set_got_rex64): Override modrm_class.

	* regrename.c (build_def_use): Ignore stack regs if regstack_completed.

testsuite/
	* gcc.target/i386/rop1.c: New test.

From-SVN: r231228