[clang] [lldb] [llvm] [mlir] [NFC][Support] Add llvm::uninitialized_copy (PR #138174)

[Rahul Joshi via cfe-commits]

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@@ -2981,7 +2981,7 @@ ScalarEvolution::getOrCreateAddExpr(ArrayRef<const SCEV *> Ops,
       static_cast<SCEVAddExpr *>(UniqueSCEVs.FindNodeOrInsertPos(ID, IP));
   if (!S) {
     const SCEV **O = SCEVAllocator.Allocate<const SCEV *>(Ops.size());
-    std::uninitialized_copy(Ops.begin(), Ops.end(), O);
+    llvm::uninitialized_copy(Ops, O);
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jurahul wrote:

need it? No.  But it seems we have this unwritten convention to use llvm:: explicitly for many of this llvm specializations of C++ standard library functions (albeit used inconsistently). I've been meaning to ask on the forum about this but not gotten around. I'll do that now. 

https://github.com/llvm/llvm-project/pull/138174