https://github.com/vitalybuka created 
https://github.com/llvm/llvm-project/pull/121115

This makes `undefined` more consistent.

`vptr` check adds additional constraints:
1. rtti is no, or compilation error
2. c++abi, or linking error
3. trap is off,  or silently disabled

So it's not obvious if `-fsanitizer=undefined`
will have it on.



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