zmodem wrote:

The linked bug does say "reverting it locally fixed the testing failures" which 
is a pretty strong indication.

I'm afraid we don't have a small reproducer yet, but 
https://crbug.com/493894786#comment4 and forward has a call stack and 
disassembly.

It looks like we're failing a control-flow guard check when calling a virtual 
destructor. I'm guessing that relates to the newly emitted vector deleting dtor.

We'll keep digging :-)

https://github.com/llvm/llvm-project/pull/185653
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