[llvm] [VPlan] Migrate VPBuilder to VPInsertPt fully (NFC) (PR #209764)

[Ramkumar Ramachandra via llvm-commits]

================
@@ -2035,7 +2035,7 @@ static bool handleFirstArgMinOrMax(
         InductionDescriptor::IK_IntInduction,
         nullptr, // No FPBinOp for integer induction
         WideIV->getStartValue(), FinalCanIV, WideIV->getStepValue());
-    DerivedIVRecipe->insertBefore(&*Builder.getInsertPoint());
+    DerivedIVRecipe->insertBefore(Builder.getRecipeAtInsertPoint());
----------------
artagnon wrote:

See

```cpp
    operator VPRecipeBase *() const {
      return Point == Block->end() ? nullptr : &*Point;
    }
```

https://github.com/llvm/llvm-project/pull/209764