LLVM Pass may be broken under LLVM 5.0.1

[fundamental]

It looks like they've changed their API slightly for LLVM 5. Currently the LLVM pass has a chance to throw:

 /usr/include/llvm-5.0/llvm/IR/Type.h:363: llvm::Type* llvm::Type::getArrayElementType() const: Assertion `getTypeID() == ArrayTyID' failed

[fundamental]

It looks like gtest plays a role in getting this sort of error, so some investigation is needed to see what gtest ends up doing to the IR.