writer: Annotate pointer representation

writer: Annotate pointer representation

When starring at abixml I noticed that abixml --annotate would not
annotate pointer-type-def XML elements.  This patch fixes that and
makes the code of write_pointer_type_def easier to debug.

	* src/abg-writer.cc (write_pointer_type_def): Invoke annotate.
	Add a temporary for the output of write_context::get_id_for_type.
	It makes it easier to inspect in the debugger.
	* tests/data/test-annotate/libtest23.so.abi: Adjust.
	* tests/data/test-annotate/libtest24-drop-fns-2.so.abi: Adjust.
	* tests/data/test-annotate/libtest24-drop-fns.so.abi: Adjust.
	* tests/data/test-annotate/test1.abi: Adjust.
	* tests/data/test-annotate/test13-pr18894.so.abi: Adjust.
	* tests/data/test-annotate/test14-pr18893.so.abi: Adjust.
	* tests/data/test-annotate/test15-pr18892.so.abi: Adjust.
	* tests/data/test-annotate/test17-pr19027.so.abi: Adjust.
	* tests/data/test-annotate/test18-pr19037-libvtkRenderingLIC-6.1.so.abi:
	Adjust.
	* tests/data/test-annotate/test19-pr19023-libtcmalloc_and_profiler.so.abi:
	Adjust.
	* tests/data/test-annotate/test20-pr19025-libvtkParallelCore-6.1.so.abi:
	Adjust.
	* tests/data/test-annotate/test21-pr19092.so.abi: Adjust.
	* tests/data/test-annotate/test5.o.abi: Adjust.

Signed-off-by: Dodji Seketeli <dodji@redhat.com>