use rtx_code_label more

use rtx_code_label more

gcc/

	* asan.c, cfgexpand.c, config/alpha/alpha.md, config/arm/arm.c,
	config/epiphany/epiphany.md, config/h8300/h8300.c, config/i386/i386.md,
	config/m32r/m32r.c, config/mcore/mcore.md, config/mips/mips.c,
	config/mips/mips.md, config/nios2/nios2.c, config/pa/pa.c,
	config/s390/s390.c, config/s390/s390.md, config/sh/sh-mem.cc,
	config/sh/sh.c, config/sparc/sparc.c, dojump.c, function.c, optabs.c,
	stmt.c: Assign the result of gen_label_rtx to rtx_code_label * instead
	of rtx.

From-SVN: r214841