[clang] [clang][clangir] add vpaddl and vpaddlq support (PR #191845)

[Andrzej Warzyński via cfe-commits]

================
@@ -196,6 +196,40 @@ static mlir::Value emitNeonCall(CIRGenModule &cgm, CIRGenBuilderTy &builder,
       isConstrainedFPIntrinsic, shift, rightshift);
 }
 
+static cir::VectorType getVPaddlInputVectorType(cir::VectorType resType,
+                                                bool usgn) {
+  mlir::Type elemTy = resType.getElementType();
+  uint64_t lanes = resType.getSize();
+  auto intTy = mlir::dyn_cast<cir::IntType>(elemTy);
+  if (!intTy) {
+    llvm_unreachable("vpaddl result type must be an integer vector");
+  }
----------------
banach-space wrote:

I would use plain assert in this case.
```suggestion
  assert(intTy && "vpaddl result type must be an integer vector");
```

https://github.com/llvm/llvm-project/pull/191845