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Ensure that variant part discriminator is read by MetadataLoader #128
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Summary: https://reviews.llvm.org/D42082 introduced variant parts to debug info in LLVM. Subsequent work on the Rust compiler has found a bug in that patch; namely, there is a path in MetadataLoader that fails to restore the discriminator. This patch fixes the bug. This was accepted by upstream LLVM here: https://reviews.llvm.org/D52340
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https://reviews.llvm.org/D42082 introduced variant parts to debug info
in LLVM. Subsequent work on the Rust compiler has found a bug in that
patch; namely, there is a path in MetadataLoader that fails to restore
the discriminator.
This patch fixes the bug.
This was accepted by upstream LLVM here: https://reviews.llvm.org/D52340
It is needed for rust-lang/rust#54004