libgccjit: Add ability to get the alignment of a type

libgccjit: Add ability to get the alignment of a type

gcc/jit/ChangeLog:

	* docs/topics/compatibility.rst (LIBGCCJIT_ABI_28): New ABI tag.
	* docs/topics/expressions.rst: Document gcc_jit_context_new_alignof.
	* jit-playback.cc (new_alignof): New method.
	* jit-playback.h: New method.
	* jit-recording.cc (recording::context::new_alignof): New
	method.
	(recording::memento_of_sizeof::replay_into,
	recording::memento_of_typeinfo::replay_into,
	recording::memento_of_sizeof::make_debug_string,
	recording::memento_of_typeinfo::make_debug_string,
	recording::memento_of_sizeof::write_reproducer,
	recording::memento_of_typeinfo::write_reproducer): Rename.
	* jit-recording.h (enum type_info_type): New enum.
	(class memento_of_sizeof class memento_of_typeinfo): Rename.
	* libgccjit.cc (gcc_jit_context_new_alignof): New function.
	* libgccjit.h (gcc_jit_context_new_alignof): New function.
	* libgccjit.map: New function.

gcc/testsuite/ChangeLog:

	* jit.dg/all-non-failing-tests.h: New test.
	* jit.dg/test-alignof.c: New test.