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In https://reviews.llvm.org/D26229 I've proposed dropping support for old style scalar TBAA metadata. Here is the proposed commit message: "We've had support for auto upgrading old style scalar TBAA access metadata into the "new" struct path aware TBAA metadata for 3 years now. The only way to actually gene...

...d representation and reading it back in then the > auto-upgrade logic will do the right thing for you. You do *not* > need to do anything special here. However, I'd still appreciate it > if can give me a thumbs-up or thumbs-down after doing some basic > sanity testing with D26229 applied locally. > > - You'll only be affected by this change if you're creating IR in > memory (for instance via the IRBuilder interface), use the old TBAA > metadata representation and don't have an intermediate IR or > bitcode parsing step that would have auto-u...