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[ADT] Fix IWYU for hashing-adjacent files (#194297)
Add explicit includes so these files keep building after we trim transitive includes from xxhash.h. For example, FoldingSet.cpp calls llvm::uninitialized_copy, which is declared in llvm/ADT/STLExtras.h and today reaches the file only transitively. Also drop the vestigial `#include "llvm/ADT/Hashing.h"` from llvm/ADT/STLExtras.h — no name from Hashing.h is used there.