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from 86efa55197e libphobos: Merge upstream phobos f7249cf45 new 7722c043f05 libiberty: add helper to swap doubly-linked list wrappers

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Summary of changes: include/doubly-linked-list.h | 37 ++++++++++++++++++++++++--- libiberty/testsuite/test-doubly-linked-list.c | 22 ++++++++++++++++ 2 files changed, 55 insertions(+), 4 deletions(-)