* cgraph.h (cgraph_node): Add 'lowered' state.
	(cgraph_lower_function): Declare.
	* cgraphunit.c (cgraph_finalize_function): Initialize lowered flag.
	(cgraph_lower_function): New function.
	(cgraph_create_edges): Deal with lowered function bodies.
	(verify_cgraph_node): Likewise.
	(cgraph_analyze_function): Do lowering job.
	(cgraph_build_static_cdtor): Likewise.
	* function.h (struct function): Add saved_eh and saved_cfg.
	* integrate.c (copy_decl_for_inlining): Kill LABEL_DECL_UID field.
	* tree-cfg.c (fold_cond_expr_cond): Export.
	* tree-flow.h (fold_cond_expr_cond): Declare.
	* tree-inline.c: Include basic-block, ggc, tree-flow, except.h and
	pointer-set.
	(struct_inline_data): Kill fnd, first_inlined_fn, ret_label,
	in_target_cleanup_p, tree_pruner, tsi; add callee, caller and
	callee_cfun, block, eh_region, eh_region_offset.
	(inlining_p): New predicate.
	(remap_decl): Update for new inline_data; declare newly created inline
	vars in low gimple way.
	(copy_body_r): Update for new datastructure, simplify some of handling
	when we are in gimple; remap LABEL_DECLs for EH; copy TREE_BLOCK;
	deal with RESX_EXPRs.
	(copy_bb): New.
	(copy_edges_for_bb): Likewise.
	(remap_decl_1): New.
	(copy_cfg_body): New.
	(copy_generic_body): Rewrite to work on low gimple.
	(copy_body): Turn into simple wrapper around copy_cfg_body.
	(setup_one_parameter): Insert new statements into given basic block.
	(initialize_initialized_parameters): Likewise, reorganize way things are
	gimplified.
	(declare_return_variable): Update for new inline data datastructure.
	(inline_forbidden_p): Work on low gimple.
	(estimate_num_insns): Likewise.
	(expand_call_inline): Work on CFG.
	(push_cfun, pop_cfun): New functions.
	(cfun_stack): New stack.
	(add_lexical_block): New function.
	(gimple_expand_calls_inline): Work on basic block.
	(optimize_inline_calls): Likewise.
	(clone_body, save_body, unsave_ewpr_now): Update for new
	datastructures.
	(declare_inline_vars): Work on block instead of bind_expr.
	(inlining_p): New predicate.
	* tree-inline.h (push_cfun, pop_cfun): Declare.
	* tree-optimize.c: Include except.h
	(all_lowering_passes): New variable.
	(execute_fixup_cfg, pass_fixup_cfg): New pass.
	(init_tree_optimization_passes): Move some to all_lowering_passes.
	(tree_lowering_passes): New function.
	(tree_rest_of_compilation): Register cfg hooks; save/unsave eh.

Co-Authored-By: Dale Johannesen <dalej@apple.com>
Co-Authored-By: Jan Hubicka <jh@suse.cz>
Co-Authored-By: Stuart Hastings <stuart@apple.com>

From-SVN: r99840