re PR c/24101 (Segfault with preprocessed source)

libcpp/

	PR c/24101
	* init.c (read_original_filename): Temporarily set
	state.in_directive before calling _cpp_lex_direct for
	CPP_HASH tokens.

gcc/

	PR c/24101
	* toplev.c (process_options): Initialize debug_hooks early
	in case lang_hooks.post_options ends up calling a debug_hook.

gcc/testsuite/

	PR c/24101
	* gcc.dg/pr24101-1.i, gcc.dg/pr24101-2.i: New tests.
	* gcc.dg/dg.exp: Run main loop also for *.i files.

From-SVN: r106677