jit: implement gcc_jit_context_new_rvalue_from_vector

jit: implement gcc_jit_context_new_rvalue_from_vector

This patch implements a new API entrypoint:

/* Build a vector rvalue from an array of elements.

   "vec_type" should be a vector type, created using gcc_jit_type_get_vector.

   This API entrypoint was added in LIBGCCJIT_ABI_10; you can test for its
   presence using
     #ifdef LIBGCCJIT_HAVE_gcc_jit_context_new_rvalue_from_vector
*/
extern gcc_jit_rvalue *
gcc_jit_context_new_rvalue_from_vector (gcc_jit_context *ctxt,
                                        gcc_jit_location *loc,
                                        gcc_jit_type *vec_type,
                                        size_t num_elements,
                                        gcc_jit_rvalue **elements);

gcc/jit/ChangeLog:
	* docs/cp/topics/expressions.rst (Vector expressions): New
	section.
	* docs/topics/compatibility.rst (LIBGCCJIT_ABI_10): New ABI tag.
	* docs/topics/expressions.rst (Vector expressions): New section.
	* docs/topics/types.rst (gcc_jit_type_get_vector): Add link to
	gcc_jit_context_new_rvalue_from_vector.
	* jit-common.h (gcc::jit:recording::vector_type): New forward
	decl.
	* jit-playback.c
	(gcc::jit::playback::context::new_rvalue_from_vector): New method.
	* jit-playback.h
	(gcc::jit::playback::context::new_rvalue_from_vector): New method.
	* jit-recording.c: In namespace gcc::jit::
	(class comma_separated_string): New class.
	(comma_separated_string::comma_separated_string): New ctor,
	adapted from recording::call::make_debug_string.
	(comma_separated_string::~comma_separated_string): New dtor.
	In namespace gcc::jit::recording::
	(context::new_rvalue_from_vector): New method.
	(type::get_vector): Update for renaming of memento_of_get_vector.
	(class memento_of_get_vector): Rename to...
	(class vector_type): ..this.
	(memento_of_new_rvalue_from_vector::memento_of_new_rvalue_from_vector):
	New ctor.
	(memento_of_new_rvalue_from_vector::replay_into): New method.
	(memento_of_new_rvalue_from_vector::visit_children): New method.
	(memento_of_new_rvalue_from_vector::make_debug_string): New
	method.
	(memento_of_new_rvalue_from_vector::write_reproducer): New method.
	(call::make_debug_string): Split out arg-printing code into ctor
	for comma_separated_string.
	* jit-recording.h: In namespace gcc::jit::recording::
	(context::new_rvalue_from_vector): New method.
	(type::dyn_cast_vector_type): New virtual function.
	(class memento_of_get_vector): Rename to...
	(class vector_type): ...this.
	(vector_type::unqualified): Remove this vfunc override in favor
	of...
	(vector_type::get_element_type): ...this new method.
	(vector_type::get_num_units): New method.
	(vector_type::dyn_cast_vector_type): New vfunc override.
	(class memento_of_new_rvalue_from_vector): New class.
	* libgccjit++.h (gccjit::context::new_rvalue): Add overload for
	vector of rvalue.
	* libgccjit.c (gcc_jit_context_new_binary_op): Strip off type
	qualifications when checking that both operands have same type.
	(gcc_jit_context_new_rvalue_from_vector): New API entrypoint.
	* libgccjit.h
	(LIBGCCJIT_HAVE_gcc_jit_context_new_rvalue_from_vector): New
	macro.
	(gcc_jit_context_new_rvalue_from_vector): New API entrypoint.
	* libgccjit.map (LIBGCCJIT_ABI_10): New ABI tag.

gcc/testsuite/ChangeLog:
	* jit.dg/test-expressions.c (make_test_of_vectors): New function.
	(create_code): Call it.
	* jit.dg/test-vector-rvalues.cc: New test case.

From-SVN: r253409