[clang] [CIR] Implement folder for VecSplatOp (PR #143771)

[Amr Hesham via cfe-commits]

================
@@ -142,7 +142,8 @@ void CIRCanonicalizePass::runOnOperation() {
     // Many operations are here to perform a manual `fold` in
     // applyOpPatternsGreedily.
     if (isa<BrOp, BrCondOp, CastOp, ScopeOp, SwitchOp, SelectOp, UnaryOp,
-            VecExtractOp, VecShuffleOp, VecShuffleDynamicOp, VecTernaryOp>(op))
+            VecExtractOp, VecShuffleOp, VecShuffleDynamicOp, VecSplatOp,
+            VecTernaryOp>(op))
----------------
AmrDeveloper wrote:

Done

https://github.com/llvm/llvm-project/pull/143771