AaronBallman wrote:

> IIRC we haven't been gating MSVC-compat ABI changes behind -fclang-abi-compat 
> in the past. Do you have object files where this actually matters?

Didn't we do that for vector deleting destructors because we had people who 
needed both ABIs? CC @Fznamznon 

That said, we typically only add an ABI compat flag if there's either user 
demand for it or if there's an up-front signal that it's likely to be needed 
(regardless of MSVC compat or otherwise).

https://github.com/llvm/llvm-project/pull/210305
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