analyzer: improve strdup handling [PR105899]

analyzer: improve strdup handling [PR105899]

gcc/analyzer/ChangeLog:
	PR analyzer/105899
	* kf.cc (kf_strdup::impl_call_pre): Set size of
	dynamically-allocated buffer.  Simulate copying the string from
	the source region to the new buffer.

gcc/testsuite/ChangeLog:
	PR analyzer/105899
	* c-c++-common/analyzer/pr99193-2.c: Add
	-Wno-analyzer-too-complex.
	* gcc.dg/analyzer/strdup-1.c: Include "analyzer-decls.h".
	(test_concrete_strlen): New.
	(test_symbolic_strlen): New.

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