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b0b7214fc9
Implement iterator::erase() in a simple version that erases nodes when they become empty, but doesn't try to redistribute elements among siblings for better packing. Handle coalescing across leaf nodes which may require erasing entries. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120226 91177308-0d34-0410-b5e6-96231b3b80d8