[llvm] [VPlan] Expand VPWidenIntOrFpInductionRecipe into separate recipes (PR #118638)

[Florian Hahn via llvm-commits]

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@@ -1874,12 +1874,13 @@ class VPWidenInductionRecipe : public VPHeaderPHIRecipe {
 };
 
 /// A recipe for handling phi nodes of integer and floating-point inductions,
-/// producing their vector values.
+/// producing their vector values. This won't execute any LLVM IR and will get
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fhahn wrote:

Might be good to adjust to something like the below, trying to be consistent with the existing terminology?
```suggestion
/// producing their vector values. This is an abstract recipe and must be converted to concrete recipes before executing.
```

https://github.com/llvm/llvm-project/pull/118638