I added type-based color printing to my hexdump in my kernel [1] if anyone wants to have that code. It was instrumental in finding bugs quickly in wee hours of the night sometimes, especially if you have heap corruption.
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[1] https://github.com/ChariotOS/chariot/blob/e046849c668458d25e...
At the level that LLVM's LTO operates, no information about classes or objects is left, so LLVM itself can't really devirtualize C++ methods in most cases