* toplev.c (backend_init_target): Move init_emit_regs and init_regs to...
	(backend_init) ... here; skip ira_init_once and backend_init_target.
	(target_reinit) ... and here; clear this_target_rtl->lang_dependent_initialized.
	(lang_dependent_init_target): Clear this_target_rtl->lang_dependent_initialized;
	break out rtl initialization to ...
	(initialize_rtl): ... here; call also backend_init_target and ira_init_once.
	* toplev.h (initialize_rtl): New function.
	* function.c: Include toplev.h
	(init_function_start): Call initialize_rtl.
	* rtl.h (target_rtl): Add target_specific_initialized,
	lang_dependent_initialized.

From-SVN: r212007