[llvm] [GVN/MemDep] Limit the size of the cache for non-local dependencies. (PR #150539)

[Alina Sbirlea via llvm-commits]

alinas wrote:

Any objections of adding such a limit for this cache?
I've made it a large enough value such that, if it's hitting it, it's probably worth investigating why this happens.

https://github.com/llvm/llvm-project/pull/150539