[clang] [CIR] Upstream minimal support for structure types (PR #135105)

[Erich Keane via cfe-commits]

================
@@ -400,13 +400,126 @@ def VoidPtr : Type<
       "cir::VoidType::get($_builder.getContext()))"> {
 }
 
+//===----------------------------------------------------------------------===//
+// StructType
+//
+// The base type for all RecordDecls.
+//===----------------------------------------------------------------------===//
+
+def CIR_StructType : CIR_Type<"Struct", "struct",
+    [
+      DeclareTypeInterfaceMethods<DataLayoutTypeInterface>,
+      MutableType,
+    ]> {
+  let summary = "CIR struct type";
+  let description = [{
+    Each unique clang::RecordDecl is mapped to a `cir.struct` and any object in
----------------
erichkeane wrote:

So this is actually a bit confusing/awkward.  A RecordDecl can represent a 'union' as well as a 'class' or 'struct' type.  

So I question the name of it here.

https://github.com/llvm/llvm-project/pull/135105