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from 05935e94575 PR libstdc++/80893 Fix null dereference in vector<bool> new f6e3159f36a [ARC] Recognise add_n and sub_n in combine again

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Summary of changes: gcc/ChangeLog | 7 ++++ gcc/config/arc/arc.c | 20 +++++++++--- gcc/config/arc/arc.md | 26 +++++++++++++++ gcc/config/arc/predicates.md | 5 +++ gcc/testsuite/ChangeLog | 5 +++ gcc/testsuite/gcc.target/arc/add_n-combine.c | 48 ++++++++++++++++++++++++++++ gcc/testsuite/gcc.target/arc/sub_n-combine.c | 21 ++++++++++++ 7 files changed, 128 insertions(+), 4 deletions(-) create mode 100644 gcc/testsuite/gcc.target/arc/add_n-combine.c create mode 100644 gcc/testsuite/gcc.target/arc/sub_n-combine.c