[llvm] [DAGCombiner] Fold min/max vscale, C -> C (PR #174708)

[Luke Lau via llvm-commits]

================
@@ -6253,6 +6243,34 @@ SDValue DAGCombiner::visitIMINMAX(SDNode *N) {
                                         SDLoc(N), VT, N0, N1))
     return SD;
 
+  // Fold operation with vscale operands.
+  if (N0.getOpcode() == ISD::VSCALE && N1.getOpcode() == ISD::VSCALE) {
----------------
lukel97 wrote:

Not in this PR but if someone wants to add it I'll gladly use it :)

https://github.com/llvm/llvm-project/pull/174708