Handcode gen_rtx_INSN

Handcode gen_rtx_INSN

gcc/ChangeLog:
2014-09-09  David Malcolm  <dmalcolm@redhat.com>

	* combine.c (try_combine): Eliminate checked cast on result of
	gen_rtx_INSN.
	* emit-rtl.c (gen_rtx_INSN): New function, improving over the prior
	autogenerated one by strengthening the return type and params 2 and 3
	from rtx to rtx_insn *, and by naming the params.
	* gengenrtl.c (special_rtx): Add INSN to those that are
	special-cased.
	* rtl.h (gen_rtx_INSN): New prototype.

From-SVN: r215083