function.c: Use rtx_insn

function.c: Use rtx_insn

gcc/
	* function.c (emit_initial_value_sets): Strengthen local "seq"
	from rtx to rtx_insn *.
	(instantiate_virtual_regs_in_insn): Likewise for param "insn" and
	local "seq".
	(instantiate_virtual_regs): Likewise for local "insn".
	(assign_parm_setup_reg): Likewise for locals "linsn", "sinsn".
	(reorder_blocks_1): Likewise for param "insns" and local "insn".
	(expand_function_end): Likewise for locals "insn" and "seq".
	(epilogue_done): Likewise for local "insn".
	(thread_prologue_and_epilogue_insns): Likewise for locals "prev",
	"last", "trial".
	(reposition_prologue_and_epilogue_notes): Likewise for locals
	"insn", "last", "note", "first".
	(match_asm_constraints_1): Likewise for param "insn" and local "insns".
	(pass_match_asm_constraints::execute): Likewise for local "insn".

From-SVN: r214327