ubsan: check type_info equality via strcmp

[Jonathan Sauer]

Hello,

> Another approach I'd be comfortable with would be to perform a second pass looking for a string match if the pointer match fails, and to emit a differently-worded message in that case (explaining that the problem might be due to an RTLD_LOCAL library, or using hidden visibility for the type, or linking against code produced by a compiler that violates the ABI).

+1. Isn't the case of two different type_info objects for the same type a violation of ODR anyway
(i.e. wouldn't this be something the UB sanitizer should check for)?


Jonathan