Arthur Eubanks cb3580e7ad [OpaquePtr][BitcodeWriter] Handle attributes with types
For example, byval.

Skip the type attribute auto-upgrade if we already have the type.

I've actually seen this error of the ValueEnumerator missing a type
attribute's type in a non-opaque pointer context.

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D105138
2021-06-29 14:47:29 -07:00
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