[llvm-branch-commits] [CodeGen] Limit number of analyzed predecessors (PR #142584)

[Alexis Engelke via llvm-branch-commits]

aengelke wrote:

NB: I don't claim to fully understand what this code does, but it seems to be safe to return a default value. [Example generator](https://github.com/tpde2/tpde/blob/f6e87d2e97f49f403c12a27e7cf513a44f0f5dbc/tpde-llvm/test/filetest/many-preds.test) to demonstrate the behavior, e.g. with 10k predecessors.

https://github.com/llvm/llvm-project/pull/142584