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

[Andy Kaylor via flang-commits]

andykaylor wrote:

> We probably (pretty sure) don't want to add a virtual dtor to SmallVector - that'd add a vtable pointer, increasing the size in ways that are probably unacceptable given the pervasive use of the data structure.
> 
> We should make the Impl dtor protected so it can't be polymorphically destroyed.

That's what I thought as well. It's not particularly clear since GitHub is highlighting the deleted constructor as the thing that changed, but that is what this PR does -- the "public" line is dropped below the destructor, making it protected.

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