[llvm] Reenable JumpTableToSwitch pass by default (PR #83229)

[David Spickett via llvm-commits]

DavidSpickett wrote:

> How do the build times change relative to without the pass being enabled, i.e. what does the pass contribute to the overall compile-time.

I'll get pass on/off and various threshold times for one of the large pre-processed files.

https://github.com/llvm/llvm-project/pull/83229