[clang] [CIR] Upstream local initialization for VectorType (PR #138107)

[Andy Kaylor via cfe-commits]

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@@ -1584,6 +1586,47 @@ mlir::Value ScalarExprEmitter::VisitMemberExpr(MemberExpr *e) {
   return emitLoadOfLValue(e);
 }
 
+mlir::Value ScalarExprEmitter::VisitInitListExpr(InitListExpr *e) {
+  const unsigned numInitElements = e->getNumInits();
+
+  if (e->hadArrayRangeDesignator()) {
+    cgf.cgm.errorNYI(e->getSourceRange(), "ArrayRangeDesignator");
+    return {};
+  }
+
+  if (numInitElements == 0) {
+    cgf.cgm.errorNYI(e->getSourceRange(), "InitListExpr with 0 init elements");
+    return {};
+  }
+
+  if (e->getType()->isVectorType()) {
+    const auto vectorType =
+        mlir::cast<cir::VectorType>(cgf.convertType(e->getType()));
+
+    SmallVector<mlir::Value, 16> elements;
+    for (Expr *init : e->inits()) {
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andykaylor wrote:

Can `init` be `const`?

https://github.com/llvm/llvm-project/pull/138107