[llvm] [Passes] Run SimpleLoopUnswitch after introducing invariant branches. (PR #81271)

[Alina Sbirlea via llvm-commits]

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@@ -47,10 +49,12 @@ class IVVisitor {
 
 /// simplifyUsersOfIV - Simplify instructions that use this induction variable
 /// by using ScalarEvolution to analyze the IV's recurrence.
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alinas wrote:

Add comment on what the new return value represents.

https://github.com/llvm/llvm-project/pull/81271