[patch] Use the DiagnosticHandler to print diagnostics when reading bitcode.

[Rafael Espíndola]

> I like this direction, but you seem to have dropped a lot of specificity
> from the error messages.  Is this intentional?  Why?

No, just laziness. An updated patch is attached. It also handles the
lib/LTO issue.

> s/CorrupteddBitcode/CorruptedBitcode/g

Fixed.

Cheers,
Rafael
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