libgccjit: Add support for setting the link section of global variables [PR100688]

libgccjit: Add support for setting the link section of global variables [PR100688]

2021-12-12  Antoni Boucher  <bouanto@zoho.com>

gcc/jit/
	PR target/100688
	* docs/topics/compatibility.rst (LIBGCCJIT_ABI_18): New ABI
	tag.
	* docs/topics/expressions.rst: Add documentation for the
	function gcc_jit_lvalue_set_link_section.
	* jit-playback.h: New function (set_link_section).
	* jit-recording.c: New function (set_link_section) and
	support for setting the link section.
	* jit-recording.h: New function (set_link_section) and new
	field m_link_section.
	* libgccjit.c: New function (gcc_jit_lvalue_set_link_section).
	* libgccjit.h: New function (gcc_jit_lvalue_set_link_section).
	* libgccjit.map (LIBGCCJIT_ABI_18): New ABI tag.

gcc/testsuite/
	PR target/100688
	* jit.dg/all-non-failing-tests.h: Mention new test
	link-section-assembler.
	* jit.dg/test-link-section-assembler.c: New test.
	* jit.dg/jit.exp: New helper function to test that the
	assembly contains a pattern.