analyzer: detect -Wanalyzer-allocation-size at call stmts [PR106203]

gcc/analyzer/ChangeLog:
	PR analyzer/106203
	* checker-event.h: Include "analyzer/event-loc-info.h".
	(struct event_loc_info): Move to its own header file.
	* diagnostic-manager.cc
	(diagnostic_manager::emit_saved_diagnostic): Move creation of
	event_loc_info here from add_final_event, and if we have a
	stmt_finder, call its update_event_loc_info method.
	* engine.cc (leak_stmt_finder::update_event_loc_info): New.
	(exploded_node::detect_leaks): Likewise.
	(exploded_node::detect_leaks): Pass nullptr as call_stmt arg to
	region_model::pop_frame.
	* event-loc-info.h: New file, with content taken from
	checker-event.h.
	* exploded-graph.h (stmt_finder::update_event_loc_info): New pure
	virtual function.
	* infinite-loop.cc (infinite_loop_diagnostic::add_final_event):
	Update for change to vfunc signature.
	* infinite-recursion.cc
	(infinite_recursion_diagnostic::add_final_event): Likewise.
	* pending-diagnostic.cc (pending_diagnostic::add_final_event):
	Pass in the event_loc_info from the caller, rather than generating
	it from a gimple stmt and enode.
	* pending-diagnostic.h (pending_diagnostic::add_final_event):
	Likewise.
	* region-model.cc (region_model::on_longjmp): Pass nullptr as
	call_stmt arg to region_model::pop_frame.
	(region_model::update_for_return_gcall): Likewise, but pass
	call_stmt.
	(class caller_context): New.
	(region_model::pop_frame): Add "call_stmt" argument.  Use it
	and the frame_region with a caller_context when setting
	result_dst_reg's value so that any diagnostic is reported at the
	call stmt in the caller.
	(selftest::test_stack_frames): Pass nullptr as call_stmt arg to
	region_model::pop_frame.
	(selftest::test_alloca): Likewise.
	* region-model.h (region_model::pop_frame): Add "call_stmt"
	argument.

gcc/testsuite/ChangeLog:
	PR analyzer/106203
	* c-c++-common/analyzer/allocation-size-1.c (test_9): Remove
	xfail.
	* c-c++-common/analyzer/allocation-size-2.c (test_8): Likewise.
	* gcc.dg/analyzer/allocation-size-multiline-4.c: New test.
	* gcc.dg/plugin/analyzer_cpython_plugin.c
	(refcnt_stmt_finder::update_event_loc_info): New.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>