Params of add_insn and unlink_insn_chain

Params of add_insn and unlink_insn_chain

gcc/
2014-08-26  David Malcolm  <dmalcolm@redhat.com>

	* rtl.h (add_insn): Strengthen param from rtx to rtx_insn *.
	(unlink_insn_chain): Strengthen both params from rtx to
	rtx_insn *.

	* cfgrtl.c (cfg_layout_function_header): Likewise for this
	variable.
	(unlink_insn_chain): Likewise for params "first" and "last".
	Remove now-redundant checked cast.
	(record_effective_endpoints): Replace use of NULL_RTX with NULL.
	(fixup_reorder_chain): Strengthen local "insn" from rtx to
	rtx_insn *.
	* emit-rtl.c (link_insn_into_chain): Likewise for all three
	params.
	(add_insn): Likewise for param "insn" and local "prev".
	(add_insn_after_nobb): Likewise for both params and local "next".
	(add_insn_before_nobb): Likewise for both params and local "prev".
	(add_insn_after): Rename param "after" to "uncast_after",
	introducing local "after" with another checked cast.
	(add_insn_before): Rename params "insn" and "before", giving them
	"uncast_" prefixes, adding the old names back using checked casts.
	(emit_note_after): Likewise for param "after".
	(emit_note_before): Likewise for param "before".
	(emit_label): Add a checked cast.

From-SVN: r214536