[SimplifyCFG] Relax `cttz` cost check in `simplifySwitchOfPowersOfTwo`

We should be able to allow `simplifySwitchOfPowersOfTwo` transform
to take place, as, on recent X86 targets, the weighted latency-size
appears to be 2. This favours computing trailing zeroes and indexing
into a smaller value table, over generating a jump table with an
indirect branch, which overall should be more efficient.

GitOrigin-RevId: 1247fddf3676543837b71965c88f021072513c63
2 files changed