`find_path` blows up exponentially

[Veykril]

In the project that can't be shared publicly rust-analyzer started hanging up all worker threads within find_path_module / calculate_best_path. I assume that it is not actually hanging (as the recursion does look like having appropriate exit conditions everywhere) but instead running into a search tree so wide that with a max depth of 15 (

rust-analyzer/crates/hir-def/src/find_path.rs

Line 48 in cdb4f96

const MAX_PATH_LEN: usize = 15;

) we just run into too much work to do depending on the project setup. Lowering that to 5 seemed to somewhat fix the issue in the project somewhat confirming my assumption