[llvm] [InlineCost] Correct the default branch cost for the switch statement (PR #85160)

[Quentin Dian via llvm-commits]

DianQK wrote:

> Please don't put godbolt links in source code. If you absolutely need to refer to something, please file a bug and refer to that.

The new issue is https://github.com/llvm/llvm-project/issues/90929.

> I'd like to see a test that actually verifies the computed cost here.

Done. I'm sorry for the late response.

https://github.com/llvm/llvm-project/pull/85160