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from 0187c03be31 Don't register nonsensical relations. new 4e0f56d7af9 Move statics to threader pass class. new bc5baac5c37 Add debug counters to back threader. new 91bac9fed5d libstdc++: Fix range access for empty std::valarray [PR103022]

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Summary of changes: gcc/dbgcnt.def | 4 + gcc/passes.def | 10 +- gcc/tree-ssa-threadbackward.c | 179 ++++++++++++++------- libstdc++-v3/include/std/valarray | 30 +++- .../testsuite/26_numerics/valarray/103022.cc | 15 ++ .../testsuite/26_numerics/valarray/range_access.cc | 49 +++++- .../26_numerics/valarray/range_access2.cc | 22 ++- 7 files changed, 227 insertions(+), 82 deletions(-) create mode 100644 libstdc++-v3/testsuite/26_numerics/valarray/103022.cc