[LLVMdev] bit code file incompatibility due to debug info changes

[Eric Christopher]

>>
>> At a minimum, it seems like we need a version number in the debug info
>> metadata so we can detect this situation and avoid crashing.
>
>
> Or to put it in the terms of the IR: we need to autoupgrade the debug info
> metadata just like we do intrinsics. With debug info this might (at the
> worst) involve dropping old metadata.
>

The verifier is probably the best route here. I think if we fail debug
info verification we can just strip it and continue.

-eric

>>
>>
>> I don't have a test case but we should be able to come up with one if
>> needed.
>
>
> I think doing so would be useful.
>
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