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

[Krzysztof Drewniak via cfe-commits]

krzysz00 wrote:

I don't know if I'll be able to get to the SerializeToHsaco fix today, but passing in `SmallVectorImpl<char>&` would be my preferred solution ...

Or really that should be `MemoryBuffer &` or some other such structure if feasible.

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