After we landed https://reviews.llvm.org/D127383, the compiler may crash due to it tries to access a may-null value. This is because https://github.com/llvm/llvm-project/blob/051738b08cf5e39fd274dd379147d1c19e2b5b20/llvm/lib/Analysis/MemoryLocation.cpp#L121-L122 may return null after we land D127383.
This should be a noop before D127383 landed.
Since there is a comment. I am not sure if this is a good fix.