In a future change, this representation will allow us to use the new inrange
annotation on getelementptr to allow the optimizer to split vtable groups.
Differential Revision: https://reviews.llvm.org/D22296
llvm-svn: 289584
I broke this locally while working on PR20337 and no test caught that. Now
there's coverage for this, and a comment explaining why this is needed.
llvm-svn: 227068