I tracked this down to a single commit that if reverted stops the test
case from segfaulting: 2d5820c. This is a patch that improves
CorrelatedValuePropagation to also handle And instructions.

I am currently working on finding the exact bug - I am not yet sure if
the bug is actually in that pass or if this change merely exposes
something else.

One thing I tried was to insert a clearing of the LazyValueInfo cache
before each call to it. This changed the results somewhat, but llvm-lto
still crashes.

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https://bugs.launchpad.net/bugs/1867173

Title:
  FTBFS with llvm-10

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