[llvm] [llvm] DLLExport public methods from SmallVector (PR #127850)

[Jakub Kuderski via llvm-commits]

kuhar wrote:

> Can you collapse all the Support changes into a single PR and the set of changes for ADT into a single PR?

I think a large change like this, no matter if split into a sequence of small PRs or not, requires an RFC on discourse.

https://github.com/llvm/llvm-project/pull/127850