[llvm] [VPlan] Introduce recipes for VP loads and stores. (PR #87816)

[via llvm-commits]

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@@ -9590,10 +9467,148 @@ void VPWidenMemoryInstructionRecipe::execute(VPTransformState &State) {
         NewLI = Builder.CreateVectorReverse(NewLI, "reverse");
     }
 
-    State.set(getVPSingleValue(), NewLI, Part);
+    State.set(this, NewLI, Part);
+  }
+}
+
+void VPWidenVPLoadRecipe::execute(VPTransformState &State) {
+  assert(State.UF == 1 && "Expected only UF == 1 when vectorizing with "
+                          "explicit vector length.");
+  // FIXME: Support reverse loading after vp_reverse is added.
+  assert(!isReverse() && "Reverse loads are not implemented yet.");
+
+  // Attempt to issue a wide load.
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ayalz wrote:

```suggestion
```

https://github.com/llvm/llvm-project/pull/87816