ipa-cp: Avoid an ICE processing self-recursive cloned edges (PR 93707)

ipa-cp: Avoid an ICE processing self-recursive cloned edges (PR 93707)

2020-02-27  Martin Jambor  <mjambor@suse.cz>
	    Feng Xue  <fxue@os.amperecomputing.com>

	PR ipa/93707
	* ipa-cp.c (same_node_or_its_all_contexts_clone_p): Replaced with
	new function calls_same_node_or_its_all_contexts_clone_p.
	(cgraph_edge_brings_value_p): Use it.
	(cgraph_edge_brings_value_p): Likewise.
	(self_recursive_pass_through_p): Return false if caller is a clone.
	(self_recursive_agg_pass_through_p): Likewise.

	testsuite/
	* gcc.dg/ipa/pr93707.c: New test.