gcc/ChangeLog:
	* cgraph.c (cgraph_c_finalize): New function.
	* cgraph.h (cgraph_c_finalize): New prototype.
	(cgraphunit_c_finalize): New prototype.
	* cgraphunit.c (first_analyzed): Move from analyze_functions
	to file-scope.
	(first_analyzed_var): Likewise.
	(analyze_functions): Move static variables into file-scope.
	(cgraphunit_c_finalize): New function.
	* diagnostic.c (diagnostic_finish): Free the memory for
	context->classify_diagnostic and context->printer, running the
	destructor for the latter.
	(bt_stop): Use toplev::main.
	* dwarf2out.c (dwarf2out_finalize): New function.
	* dwarf2out.h (dwarf2out_c_finalize): New prototype.
	* gcse.c (gcse_c_finalize): New function.
	* gcse.h (gcse_c_finalize): New prototype.
	* ggc-page.c (init_ggc): Make idempotent.
	* input.c (input_location): Initialize to UNKNOWN_LOCATION.
	* ipa-cp.c (ipa_cp_c_finalize): New function.
	* ipa-prop.h (ipa_cp_c_finalize): New prototype.
	* ipa-pure-const.c (function_insertion_hook_holder): Move to be
	a field of class pass_ipa_pure_const.
	(node_duplication_hook_holder): Likewise.
	(node_removal_hook_holder): Likewise.
	(register_hooks): Convert to method...
	(pass_ipa_pure_const::register_hooks): ...here, converting
	static variable init_p into...
	(pass_ipa_pure_const::init_p): ...new field.
	(pure_const_generate_summary): Update invocation of
	register_hooks to invoke as a method of current_pass.
	(pure_const_read_summary): Likewise.
	(propagate): Convert to...
	(pass_ipa_pure_const::execute): ...method.
	* ipa-reference.c (ipa_init): Move static bool init_p from here
	to...
	(ipa_init_p): New file-scope variable, so that it can be reset
	when repeatedly invoking the compiler within one process by...
	(ipa_reference_c_finalize): New function.
	* ipa-reference.h (ipa_reference_c_finalize): New.
	* main.c (main): Replace invocation of toplev_main with
	construction of a toplev instance, and call its "main" method.
	* params.c (global_init_params): Add an assert that
	params_finished is false.
	(params_c_finalize): New.
	* params.h (params_c_finalize): New.
	* passes.c (execute_ipa_summary_passes): Set "current_pass" before
	invoking generate_summary, for the benefit of pass_ipa_pure_const.
	(ipa_write_summaries_2): Assign "pass" to "current_pass" global
	before calling write_summary hook.
	(ipa_write_optimization_summaries_1): Likewise when calling
	write_optimization_summary hook.
	(ipa_read_summaries_1): Likewise for read_summary hook.
	(ipa_read_optimization_summaries_1): Likewise for
	read_optimization_summary hook.
	(execute_ipa_stmt_fixups): Likewise.
	* stringpool.c (init_stringpool): Clean up if we're called more
	than once.
	* timevar.c (timevar_init): Ignore repeated calls.
	* toplev.c: Include "dwarf2out.h", "ipa-reference.h", "gcse.h",
	"ipa-prop.h".
	(general_init): Reset "input_location" to UNKNOWN_LOCATION.
	(initialize_rtl): Move static local "initialized_once"
	into file scope, and rename to...
	(rtl_initialized): New variable.
	(do_compile): Move timevar initialization from here to
	toplev::start_timevars.
	(toplev::toplev, toplev::~toplev, toplev::start_timevars,
	toplev::finalize): New functions.
	(toplev_main): Rename to...
	(toplev::main): ...this.
	* toplev.h (class toplev): New class.

From-SVN: r216522