Bug 19025 - abixml writer forgets to emit some member types

Bug 19025 - abixml writer forgets to emit some member types

When a member type (a type that is a member of a class) M is
referenced by some types emitted by abixml, but the context of M (the
class type which M is a member of) is not itself referenced by any ABI
artifact, then abixml forgets to emit the context of M and thus M
itself.

With this patch, when the abixml writer has emitted almost all ABI
artifacts for the current translation unit, it looks for types that
have been referenced by the emitted ABI artifacts, but that haven't
been emitted themselves.

It then emits those referenced-but-not-emitted types, and makes sure
their contexts are emitted as well.

	* include/abg-fwd.h (is_namespace): Fix prototype.
	* src/abg-writer.cc (struct type_ptr_comp_functor): New internal
	type.
	(sort_type_ptr_map): New static function.
	(write_context::m_referenced_types_map): Renamed
	m_referenced_fntypes_map data member into this.
	(write_context::get_referenced_types): New member function.
	(write_context::record_type_as_referenced): Renamed
	record_fntype_as_referenced member function into this.  Adjust.
	(write_context::type_is_referenced): Renamed fntype_is_referenced
	into this.
	(write_context::clear_referenced_types_map): Renamed
	clear_referenced_fntypes_map member function into this.  Adjust.
	(write_decl_in_scope): New static function.
	(write_translation_unit): Use it here to emit types that are
	referenced by other types in the TU, but that are not emitted.
	Adjust.
	(write_pointer_type_def, write_reference_type_def)
	(write_typedef_decl): Record the underlying types referenced by
	the emitted types as being, well, referenced.
	* tests/data/test-read-dwarf/test20-pr19025-libvtkParallelCore-6.1.so:
	New test binary input.
	* tests/data/test-read-dwarf/test20-pr19025-libvtkParallelCore-6.1.so.abi:
	New reference output of the binary input above.
	* tests/data/Makefile.am: Add the new test material above to the
	source distribution.
	* tests/test-read-dwarf.cc (in_out_spec): Add the new test inputs.
	* tests/data/test-read-dwarf/test9-pr18818-clang.so.abi: Adjust.
	* tests/data/test-read-dwarf/test10-pr18818-gcc.so.abi: Likewise.
	* tests/data/test-read-dwarf/test12-pr18844.so.abi: Likewise.
	* tests/data/test-read-dwarf/test13-pr18894.so.abi: Likewise.
	* tests/data/test-read-dwarf/test14-pr18893.so.abi: Likewise.
	* tests/data/test-read-dwarf/test15-pr18892.so.abi: Likewise.
	* tests/data/test-read-dwarf/test16-pr18904.so.abi: Likewise.
	* tests/data/test-read-dwarf/test17-pr19027.so.abi: Likewise.
	* tests/data/test-read-dwarf/test18-pr19037-libvtkRenderingLIC-6.1.so.abi:
	Likewise.
	* tests/data/test-read-dwarf/test19-pr19023-libtcmalloc_and_profiler.so.abi:
	Likewise.

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