[clang] [CIR] Implement handling for VectorType with size 3 (PR #161232)

[Andy Kaylor via cfe-commits]

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@@ -314,21 +314,36 @@ void CIRGenFunction::emitStoreOfScalar(mlir::Value value, Address addr,
                                        bool isInit, bool isNontemporal) {
   assert(!cir::MissingFeatures::opLoadStoreThreadLocal());
 
+  mlir::Type srcTy = addr.getElementType();
   if (const auto *clangVecTy = ty->getAs<clang::VectorType>()) {
-    // Boolean vectors use `iN` as storage type.
-    if (clangVecTy->isExtVectorBoolType())
-      cgm.errorNYI(addr.getPointer().getLoc(),
-                   "emitStoreOfScalar ExtVectorBoolType");
+    if (auto vecTy = dyn_cast<cir::VectorType>(srcTy)) {
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andykaylor wrote:

At some point we may need to check that this is not a scalable vector type. Can you add a missing feature assert for scalable vectors here?

https://github.com/llvm/llvm-project/pull/161232