[IEPM] Introduce debug hook for inline entry point markers

[IEPM] Introduce debug hook for inline entry point markers

The inline_entry hook will be given a definition in a later patch.

for  gcc/ChangeLog

	* debug.h (gcc_debug_hooks): Add inline_entry.
	* dbxout.c (dbx_debug_hooks, xcoff_debug_hooks): Likewise.
	* debug.c (do_nothing_debug_hooks): Likewise.
	* vmsdbgout.c (vmsdbg_debug_hooks): Likewise.
	* dwarf2out.c (dwarf2_debug_hooks): Likewise.
	(dwarf2_lineno_debug_hooks): Likewise.

From-SVN: r255570