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

[David Spickett via llvm-commits]

DavidSpickett wrote:

Also if you need someone to dig more into Flang specifically, I can ask one of my Linaro colleagues to look into this (I just report problems, they actually work on it :) ).

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