PR jit/66546: Add gcc_jit_context_set_bool_allow_unreachable_blocks

PR jit/66546: Add gcc_jit_context_set_bool_allow_unreachable_blocks

gcc/jit/ChangeLog:
	PR jit/66546
	* docs/cp/topics/contexts.rst
	(gccjit::context::set_bool_allow_unreachable_blocks): New.
	* docs/topics/compatibility.rst (LIBGCCJIT_ABI_2): New.
	* docs/topics/contexts.rst (Options): Add notes discussing the
	transition from enums to entrypoints for new options.
	(gcc_jit_context_set_bool_allow_unreachable_blocks): New.
	* docs/_build/texinfo/libgccjit.texi: Regenerate.
	* jit-common.h (gcc::jit::inner_bool_option): New enum.
	* jit-recording.c: Within namespace gcc::jit...
	(recording::context::context): Handle m_inner_bool_options.
	(recording::context::set_inner_bool_option): New.
	(inner_bool_option_reproducer_strings): New.
	(recording::context::log_all_options): Log the "inner" bool
	options.
	(recording::context::log_inner_bool_option): New.
	(recording::context::dump_reproducer_to_file): Write initializers
	for "inner" bool options.
	(recording::function::validate): Don't check for block
	reachability if INNER_BOOL_OPTION_ALLOW_UNREACHABLE_BLOCKS is set.
	* jit-recording.h: Within namespace gcc::jit...
	(recording::context::set_inner_bool_option): New.
	(recording::context::get_inner_bool_option): New.
	(recording::context::log_inner_bool_option): New.
	(recording::context::m_inner_bool_options): New.
	* libgccjit++.h
	(gccjit::context::set_bool_allow_unreachable_blocks): New.
	* libgccjit.c
	(gcc_jit_context_set_bool_allow_unreachable_blocks): New.
	* libgccjit.h: Add note about options present in the
	initial release of libgccjit.
	(gcc_jit_context_set_bool_allow_unreachable_blocks): New API
	entrypoint.
	(LIBGCCJIT_HAVE_gcc_jit_context_set_bool_allow_unreachable_blocks):
	New macro.
	* libgccjit.map (LIBGCCJIT_ABI_2): New, containing...
	(gcc_jit_context_set_bool_allow_unreachable_blocks): ...this new
	entrypoint.

gcc/testsuite/ChangeLog:
	PR jit/66546
	* jit.dg/all-non-failing-tests.h: Add note about
	test-validly-unreachable-block.c.
	* jit.dg/test-validly-unreachable-block.c: New file.

From-SVN: r225206