[llvm-branch-commits] [mlir] [mlir][SCF] Fold unused `index_switch` results (PR #173560)

[lonely eagle via llvm-branch-commits]

linuxlonelyeagle wrote:

> > Part of it is the functionality of remove-dead-values, but I believe it ought to be implemented within remove-dead-values.
> 
> Whatever a canonicalizer can do without a dataflow analysis should be done: the fact that another more complex pass can do it isn't a reason to not canonicalize: it less heavyweight and more generally applicable.

make semse.

https://github.com/llvm/llvm-project/pull/173560