PR middle-end/51998
	* cgraphunit.c (cgraph_analyze_function): Break cyclic aliases.
	* varpool.c (varpool_analyze_pending_decls): Likewise.

	* testsuite/gcc.dg/alias-12.c: New testcase.
	* testsuite/gcc.dg/alias-13.c: New testcase.

Co-Authored-By: Tom de Vries <tom@codesourcery.com>

From-SVN: r183836