[PATCH][gcc] libgccjit: introduce version entry points

[Andrea Corallo]

Hi, second version of the patch here cleaning up an unnecessary change.

Does not introduce regressions with make check-jit.

Andrea

gcc/jit/ChangeLog
2020-??-??  Andrea Corallo  <andrea.corallo@arm.com>

	* docs/topics/compatibility.rst (LIBGCCJIT_ABI_13): New ABI tag
	plus add version paragraph.
	* libgccjit++.h (namespace gccjit::version): Add new namespace.
	* libgccjit.c (gcc_jit_version_major, gcc_jit_version_minor)
	(gcc_jit_version_patchlevel): New functions.
	* libgccjit.h (LIBGCCJIT_HAVE_gcc_jit_version): New macro.
	(gcc_jit_version_major, gcc_jit_version_minor)
	(gcc_jit_version_patchlevel): New functions.
	* libgccjit.map (LIBGCCJIT_ABI_13) New ABI tag.

gcc/testsuite/ChangeLog
2020-??-??  Andrea Corallo  <andrea.corallo@arm.com>

	* jit.dg/test-version.c: New testcase.

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