[llvm] [gsymutil] Fix crash caused by infinite recursion in `unwrapReferencedTypedefType()` (PR #196448)

[Roy Shi via llvm-commits]

royitaqi wrote:

@ZequanWu, @dwblaikie, and @Michael137: Could you kindly review as code owner?

For example, using depth or `DenseMap` per @clayborg 's comment.


https://github.com/llvm/llvm-project/pull/196448