[llvm] [VPlan] Add VPSymbolicValueSC for typed VPValues w/o underlying IR value (PR #130507)

[Mel Chen via llvm-commits]

================
@@ -3486,11 +3487,12 @@ class VPlan {
   /// Construct a VPlan for \p L. This will create VPIRBasicBlocks wrapping the
   /// original preheader and scalar header of \p L, to be used as entry and
   /// scalar header blocks of the new VPlan.
-  VPlan(Loop *L);
+  VPlan(Loop *L, Type *InductionTy);
 
   /// Construct a VPlan with a new VPBasicBlock as entry, a VPIRBasicBlock
   /// wrapping \p ScalarHeaderBB and a trip count of \p TC.
-  VPlan(BasicBlock *ScalarHeaderBB, VPValue *TC) {
+  VPlan(BasicBlock *ScalarHeaderBB, VPValue *TC, Type *InductionTy)
+      : VectorTripCount(InductionTy), VF(InductionTy), VFxUF(InductionTy) {
----------------
Mel-Chen wrote:

Need to update the comments.

https://github.com/llvm/llvm-project/pull/130507