libgccjit: Add ability to get CPU features

libgccjit: Add ability to get CPU features

gcc/ChangeLog:
	PR jit/112466
	* Makefile.in (tm_jit_file_list, tm_jit_include_list, TM_JIT_H,
	JIT_TARGET_DEF, JIT_TARGET_H, JIT_TARGET_OBJS): New variables.
	(tm_jit.h, cs-tm_jit.h, jit/jit-target-hooks-def.h,
	s-jit-target-hooks-def-h, default-jit.o): New rules.
	(s-tm-texi): Also check timestamp on jit-target.def.
	(generated_files): Add TM_JIT_H and jit/jit-target-hooks-def.h.
	(build/genhooks.o): Also depend on JIT_TARGET_DEF.
	* config.gcc (tm_jit_file, jit_target_objs, target_has_targetjitm):
	New variables.
	* config/i386/t-i386 (i386-jit.o): New rule.
	* configure: Regenerate.
	* configure.ac (tm_jit_file_list, tm_jit_include_list,
	jit_target_objs): Add substitutes.
	* doc/tm.texi: Regenerate.
	* doc/tm.texi.in (targetjitm): Document.
	(target_has_targetjitm): Document.
	* genhooks.cc: Include jit/jit-target.def.
	* config/default-jit.cc: New file.
	* config/i386/i386-jit.cc: New file.
	* config/i386/i386-jit.h: New file.

gcc/jit/ChangeLog:
	PR jit/112466
	* Make-lang.in (JIT_OBJS): New variable.
	* jit-playback.cc (replay): Include jit-target.h and initialize
	target.
	* jit-playback.h (class populate_target_info): New class.
	* jit-recording.cc (recording::context::populate_target_info): New
	method.
	* jit-recording.h (recording::context::populate_target_info): New
	method.
	(recording::context::m_populated_target_info): New field.
	* libgccjit.cc: Include jit-target.h.
	(struct gcc_jit_target_info): New struct.
	(gcc_jit_context_get_target_info, gcc_jit_target_info_release,
	gcc_jit_target_info_cpu_supports, gcc_jit_target_info_arch,
	gcc_jit_target_info_supports_target_dependent_type): New functions.
	* libgccjit.h (gcc_jit_context_get_target_info,
	gcc_jit_target_info_release, gcc_jit_target_info_cpu_supports,
	gcc_jit_target_info_arch,
	gcc_jit_target_info_supports_target_dependent_type):
	New functions.
	* libgccjit.map (LIBGCCJIT_ABI_35): New ABI tag.
	* docs/topics/compilation.rst: Add documentation for the
	functions gcc_jit_context_get_target_info, gcc_jit_target_info_release,
	gcc_jit_target_info_cpu_supports, gcc_jit_target_info_arch,
	gcc_jit_target_info_supports_target_dependent_type.
	* docs/topics/compatibility.rst (LIBGCCJIT_ABI_35): New ABI tag.
	* jit-target-def.h: New file.
	* jit-target.cc: New file.
	* jit-target.def: New file.
	* jit-target.h: New file.

gcc/testsuite/ChangeLog:
	PR jit/112466
	* jit.dg/all-non-failing-tests.h: Mention
	test-target-info.c.
	* jit.dg/test-target-info.c: New test.
	* jit.dg/test-error-target-info.c: New test.