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from 2d8cd712b17 libstdc++: Add more nodiscard uses in <vector> new c841144a943 tree-optimization/114121 - wrong VN with context sensitive [...] new 5c01ede02a1 tree-optimization/113831 - revert original fix

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Summary of changes: gcc/testsuite/gcc.dg/torture/pr114121.c | 35 ++++++ gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-104.c | 2 +- gcc/tree-ssa-pre.cc | 5 +- gcc/tree-ssa-sccvn.cc | 189 ++++++++-------------------- gcc/tree-ssa-sccvn.h | 3 + 5 files changed, 92 insertions(+), 142 deletions(-) create mode 100644 gcc/testsuite/gcc.dg/torture/pr114121.c