Nikita Popov db561064f6 [GlobalOpt] Handle non-instruction MTI source (PR54572) ...

This was reusing a cast to GlobalVariable to check for an
Instruction, which means we'll try to dereference a null pointer
if it's not actually a GlobalVariable. We should be casting
MTI->getSource() instead.

I don't think this problem is really specific to opaque pointers,
but it certainly makes it a lot easier to reproduce.

Fixes https://github.com/llvm/llvm-project/issues/54572.

2022-03-28 14:28:47 +02:00

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