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* ipa-polymorphic-call.c (walk_ssa_copies): Recognize NULL pointer checks. (ipa_polymorphic_call_context::get_dynamic_type): Return true if type doesn't change. * cgraph.h (cgraph_indirect_call_info): New flag. * cgraph.c (cgraph_node::create_indirect_edge): Initialize it. (cgraph_node::dump): Dump it. * ipa-prop.c (ipa_analyze_call_uses): Ignore return valud of context.get_dynamic_type. (ipa_make_edge_direct_to_target): Do not speculate edge that is already speuclative. (try_make_edge_direct_virtual_call): Use VPTR_CHANGED; Do not speculate to __builtin_unreachable (ipa_write_indirect_edge_info, ipa_read_indirect_edge_info): Stream vptr_changed. * ipa-cp.c (ipa_get_indirect_edge_target_1): Use vptr_changed. * g++.dg/ipa/devirt-47.C: New testcase. From-SVN: r215898
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