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from a1224c199bc Backport "Require effective target global_constructor for t [...] new 48af0dad474 Undo commit r258760 new cb357cb30da backport "[tail-merge] Don't merge bbs with bb_has_abnormal_pred"

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Summary of changes: gcc/ChangeLog | 9 +++++++++ gcc/testsuite/ChangeLog | 9 ++++----- gcc/testsuite/gcc.dg/pr84956.c | 27 +++++++++++++++++++++++++++ gcc/tree-ssa-tail-merge.c | 4 ++-- 4 files changed, 42 insertions(+), 7 deletions(-) create mode 100644 gcc/testsuite/gcc.dg/pr84956.c