re PR debug/41700 (g++.dg/debug/dwarf2/icf.C)

re PR debug/41700 (g++.dg/debug/dwarf2/icf.C)

gcc/ChangeLog:
	PR debug/41700
	* dwarf2out.c (dwarf2_debug_hooks): Add entries for new hook (two
	locations in the source).
        (store_vcall_insn): New function.
        (lookup_vcall_insn): New function.
        (dwarf2out_virtual_call_token): Use store_vcall_insn.
	(dwarf2out_copy_call_info): New function.
	(dwarf2out_virtual_call): Use lookup_vcall_insn.
	* emit-rtl.c (try_split): Call copy_call_info debug hook.
	* debug.h (struct gcc_debug_hooks): Add copy_call_info hook.
	* debug.c (do_nothing_debug_hooks): Add dummy entry for new hook.
	(debug_nothing_rtx_rtx): New dummy hook.
	* dbxout.c (dbx_debug_hooks): Add dummy entry for new hook.
	(xcoff_debug_hooks): Likewise.
	* sdbout.c (sdb_debug_hooks): Likewise.
	* vmsdbgout.c (vmsdbg_debug_hooks): Likewise.

From-SVN: r153719