[clang] [clangd] Avoid calling resolveTypeOfCallExpr() twice in HeuristicResolver::resolveExprToType() (PR #164353)

[Nathan Ridge via cfe-commits]

HighCommander4 wrote:

@kadircet Do we have a good way of writing a regression test for something like this? Checking elapsed time seems flaky.

https://github.com/llvm/llvm-project/pull/164353