[clang] [libcxx] [mlir] [compiler-rt] [clang-tools-extra] [flang] [llvm] [libc] Make SmallVectorImpl destructor protected (PR #71439)

[Jakub Kuderski via llvm-commits]

https://github.com/kuhar commented:

Overall I think this makes sense, but the `SerializeToHsaco` changes look suboptimal

https://github.com/llvm/llvm-project/pull/71439