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8e08906973
As written earlier uninit_analysis::use_cannot_happen is duplicate functionality implemented in a complement way, not adhering to the idea of disproving a may-uninit use and eventually (I have not yet found a testcase it helps to avoid false positives) avoiding false positives because of this or different ways it imposes limits on the predicate computations. This patch removes it. * gimple-predicate-analysis.h (uninit_analysis::use_cannot_happen): Remove. * gimple-predicate-analysis.cc (can_be_invalidated_p): Remove. (uninit_analysis::use_cannot_happen): Likewise. (uninit_analysis::is_use_guarded): Do not call use_cannot_happen. (dump_predicates): Remove. (simple_control_dep_chain): Remove edge overload.
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