re PR debug/48401 (ICE: RTL check: access of elt 4 of 'var_location' with last elt 2 in expand_gimple_basic_block, at cfgexpand.c:3585)

	PR debug/48404
	* cfgexpand.c (expand_gimple_basic_block): Avoid useless assignment.
	Use PAT_VAR_LOCATION_LOC instead of INSN_VAR_LOCATION_LOC.

From-SVN: r171924