[6.2.0]Avoid unnecessary copying when building Merkle trees. #17930
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Instead of accumulating a single set of children in DirectoryTreeBuilder and later splitting it up into file, symlink and subdirectory sets, we can accumulate the latter directly.
Closes #17912.
Commit: f63ce79
PiperOrigin-RevId: 520585350
Change-Id: I02b26825976c72d59462a66ffd9afaec3d7c4176