tb-alvms.c (tb_entry_t, [...]): Store a frame pointer instead of a procedure value in each traceback entry.

2007-10-15  Olivier Hainque  <hainque@adacore.com>

	* tb-alvms.c (tb_entry_t, __gnat_backtrace): Store a frame pointer
	instead of a procedure value in each traceback entry.

	* g-trasym-vms-alpha.adb (Symbolic_Traceback): Pass frame pointer
	instead of procedure value to TBK$SYMBOLIZE.

	* s-traent-vms.adb (PV_For): Rename as FP_For and access the proper
	field.
	(TB_Entry_For): Account for the PV/FP renaming.

	* s-traent-vms.ads (Traceback_Entry): Rename PV component into FP and
	add comment.
	(Null_TB_Entry): Account for change of component name.
	(PV_For): Rename as FP_For.

From-SVN: r129338