Add a few missing checks that IPA_NODE_REF is not NULL (PR 92454)
2019-11-13 Jan Hubicka <hubicka@ucw.cz> Martin Jambor <mjambor@suse.cz> PR ipa/92454 * ipa-cp.c (spread_undeadness): Check that IPA_NODE_REF exists. (identify_dead_nodes): Likewise. testsuite/ * g++.dg/ipa/pr92454.C: New test. From-SVN: r278142
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gcc/testsuite/g++.dg/ipa/pr92454.C
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