analyzer: use tainted_allocation_size::m_mem_space [PR105017]

analyzer: use tainted_allocation_size::m_mem_space [PR105017]

gcc/analyzer/ChangeLog:
	PR analyzer/105017
	* sm-taint.cc (taint_diagnostic::subclass_equal_p): Check
	m_has_bounds as well as m_arg.
	(tainted_allocation_size::subclass_equal_p): Chain up to base
	class implementation.  Also check m_mem_space.
	(tainted_allocation_size::emit): Add note showing stack-based vs
	heap-based allocations.

gcc/testsuite/ChangeLog:
	PR analyzer/105017
	* gcc.dg/analyzer/taint-alloc-1.c: Add expected messages relating
	to heap vs stack.

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