emit-rtl.c, [...]: Replace rtx base types with more derived ones.

emit-rtl.c, [...]: Replace rtx base types with more derived ones.

gcc/
	* emit-rtl.c, expr.c, gcse.c, optabs.c, optabs.h, print-rtl.c,
	rtl.h, bb-reorder.c, builtins.c, calls.c, cfgbuild.c, cfgexpand.c,
	cfgrtl.c, cilk-common.c, config/i386/i386.md, cse.c, dwarf2cfi.c,
	except.c, final.c, function.c, gcse-common.c, genemit.c,
	haifa-sched.c, ifcvt.c, jump.c, loop-invariant.c, loop-iv.c,
	lra-constraints.c, lra.c, reload1.c, resource.c, rtlanal.c,
	sched-deps.c, sched-ebb.c, sel-sched-ir.c, sel-sched.c,
	shrink-wrap.c, stmt.c, store-motion.c: Replace rtx base types with
	more derived ones.

From-SVN: r224187