[llvm] [VPlan] Add VPIRBasicBlock, use to model pre-preheader. (PR #93398)

[Florian Hahn via llvm-commits]

================
@@ -2948,12 +2953,48 @@ class VPBasicBlock : public VPBlockBase {
     return NewBlock;
   }
 
+protected:
+  void executeRecipes(VPTransformState *State, BasicBlock *BB);
----------------
fhahn wrote:

Added, thanks!

https://github.com/llvm/llvm-project/pull/93398