[mlir] Replace `llvm::OwningArrayRef` with `std::vector` (#168803) There are several places where we use `llvm::OwningArrayRef`. The interface to this requires us to first construct temporary storage, then allocate space and set the allocated memory to 0, then copy the values we actually want into that memory, then move the array into place. Instead we can just do it all inline in a single pass by using `std::vector`. In one case we actually allocate a completely separate container and then allocate + copy the data over because `llvm::OwningArrayRef` does not (and can't) support `push_back`. Note that `llvm::SmallVector` is not a suitable replacement here because we rely on reference stability on move construction: when the outer container reallocates, we need the the contents of the inner containers to be fixed in memory, and `llvm::SmallVector` does not give us that guarantee.
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