[llvm] [SimplifyCFG] Add command-line option to disable the pass (PR #130965)

[Madhur Amilkanthwar via llvm-commits]

madhur13490 wrote:

> > The option is useful for some of the experiments we're doing. I don't see any harm in having such option and the ability to disable the pass.
> 
> Could you please provide some more details what this is useful for?

This pass aggressively converts if-else to selects. Disabling the pass and thus select generation for some of the internal benchmarks would help us narrow down the issues. 

https://github.com/llvm/llvm-project/pull/130965