[llvm] [LoopInterchange] Enable it by default (PR #124911)

[Mikael Holmen via llvm-commits]

mikaelholmen wrote:

Hello,

Just want to give a heads up that I have a testcase with three dependent loops that starts to execute forever with this patch.
I see that the opt output contains an infinite loop but I need to reduce and work more on it to get a more manageble reproducer.

I'll continue looking into this and get back.

https://github.com/llvm/llvm-project/pull/124911