[patch] Fix use after free in BitcodeReader.cpp error path

[Rafael Espíndola]

> It is just intended to be a debugging aid; I can live without it as long as
> you can live with me cursing your name when I next get this error message.
> :-P

OK, since everyone else prefers non-fatal errors, this patch just
fixes the use after free by using a fixed error message.

In a followup patch I will try to convert this to use error_code.

Cheers,
Rafael
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