* vms_data.ads: Add qualifier for the new gnatmetric '-lratio' option

	* gnat_ugn.texi: Add description of the new '-lratio' option
	Update 7.3.1 section about availability of the feature.

	* exp_smem.ads, exp_smem.adb (Make_Shared_Var_Procs): Return last
	inserted node.

	* Makefile.in: (mips-irix section): Activate build of libgmem.

From-SVN: r128339