analyzer: record per-enode saved_diagnostics

analyzer: record per-enode saved_diagnostics

Various places iterate through all of the saved_diagnostics to find
just the ones that are at a given enode.  This patch adds a per-enode
record of the diagnostics that are at each node, to save iterating
through all of the diagnostics each time.

gcc/analyzer/ChangeLog:
	* diagnostic-manager.cc (diagnostic_manager::add_diagnostic): Make
	enode param non-constant, and call add_diagnostic on it.  Add
	enode index to log message.
	(diagnostic_manager::add_diagnostic): Make enode param
	non-constant.
	* diagnostic-manager.h (diagnostic_manager::add_diagnostic):
	Likewise for both decls.
	* engine.cc
	(impl_region_model_context::impl_region_model_context): Likewise
	for enode_for_diag.
	(impl_sm_context::impl_sm_context): Likewise.
	(impl_sm_context::m_enode_for_diag): Likewise.
	(exploded_node::dump_dot): Don't pass the diagnostic manager
	to dump_saved_diagnostics.
	(exploded_node::dump_saved_diagnostics): Drop param.  Iterate
	directly through all saved diagnostics for the enode, rather
	than all saved diagnostics in the diagnostic_manager and
	filtering.
	(exploded_node::on_stmt): Make non-const.
	(exploded_node::on_edge): Likewise.
	(exploded_node::on_longjmp): Likewise.
	(exploded_node::detect_leaks): Likewise.
	(exploded_graph::get_or_create_node): Make enode_for_diag param
	non-const.
	(exploded_graph_annotator::print_enode): Iterate
	directly through all saved diagnostics for the enode, rather
	than all saved diagnostics in the diagnostic_manager and
	filtering.
	* exploded-graph.h
	(impl_region_model_context::impl_region_model_context): Make
	enode_for_diag param non-constant.
	(impl_region_model_context::m_enode_for_diag): Likewise.
	(exploded_node::dump_saved_diagnostics): Drop param.
	(exploded_node::on_stmt): Make non-const.
	(exploded_node::on_edge): Likewise.
	(exploded_node::on_longjmp): Likewise.
	(exploded_node::detect_leaks): Likewise.
	(exploded_node::add_diagnostic): New.
	(exploded_node::get_num_diagnostics): New.
	(exploded_node::get_saved_diagnostic): New.
	(exploded_node::m_saved_diagnostics): New.
	(exploded_graph::get_or_create_node): Make enode_for_diag param
	non-constant.
	* feasible-graph.cc (feasible_node::dump_dot): Drop
	diagnostic_manager from call to dump_saved_diagnostics.
	* program-state.cc (program_state::on_edge): Convert enode param
	to non-const pointer.
	(program_state::prune_for_point): Likewise for enode_for_diag
	param.
	* program-state.h (program_state::on_edge): Convert enode param
	to non-const pointer.
	(program_state::prune_for_point): Likewise for enode_for_diag
	param.