[llvm] [RISCV] Move RISCVInsertVSETVLI to after phi elimination (PR #91440)

[Philip Reames via llvm-commits]

================
@@ -426,7 +434,7 @@ DemandedFields getDemanded(const MachineInstr &MI, const RISCVSubtarget *ST) {
 /// values of the VL and VTYPE registers after insertion.
 class VSETVLIInfo {
   struct AVLDef {
-    const MachineInstr *DefMI;
+    const VNInfo *AVLVNInfo;
----------------
preames wrote:

Can this be null?  Add a comment please.

https://github.com/llvm/llvm-project/pull/91440