analyzer: fix ICE when discarding result of realloc [PR102225]

analyzer: fix ICE when discarding result of realloc [PR102225]

gcc/analyzer/ChangeLog:
	PR analyzer/102225
	* analyzer.h (compat_types_p): New decl.
	* constraint-manager.cc
	(constraint_manager::get_or_add_equiv_class): Guard against NULL
	type when checking for pointer types.
	* region-model-impl-calls.cc (region_model::impl_call_realloc):
	Guard against NULL lhs type/region.  Guard against the size value
	not being of a compatible type for dynamic extents.
	* region-model.cc (compat_types_p): Make non-static.

gcc/testsuite/ChangeLog:
	PR analyzer/102225
	* gcc.dg/analyzer/realloc-1.c (test_10): New.
	* gcc.dg/analyzer/torture/pr102225.c: New test.