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

[Eli Friedman via llvm-commits]

https://github.com/efriedma-quic commented:

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.

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

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