function.c (assign_parm_setup_reg): For a parameter passed by pointer and which can live in a register...

	* function.c (assign_parm_setup_reg): For a parameter passed by pointer
	and which can live in a register, always retrieve the value on entry.
	* var-tracking.c (add_stores): Treat the copy on entry for a parameter
	passed by invisible reference specially.
	(emit_notes_in_bb) <MO_VAL_USE>: Emit notes before the instruction.
	(vt_add_function_parameter): Correctly deal with a parameter passed by
	invisible reference.

From-SVN: r202102