[clang] [CIR] Upstream initial support for unary op (PR #131369)

[Erich Keane via cfe-commits]

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@@ -468,6 +468,55 @@ def BrOp : CIR_Op<"br",
   }];
 }
 
+//===----------------------------------------------------------------------===//
+// UnaryOp
+//===----------------------------------------------------------------------===//
+
+def UnaryOpKind_Inc   : I32EnumAttrCase<"Inc",   1, "inc">;
+def UnaryOpKind_Dec   : I32EnumAttrCase<"Dec",   2, "dec">;
+def UnaryOpKind_Plus  : I32EnumAttrCase<"Plus",  3, "plus">;
+def UnaryOpKind_Minus : I32EnumAttrCase<"Minus", 4, "minus">;
+def UnaryOpKind_Not   : I32EnumAttrCase<"Not",   5, "not">;
+
+def UnaryOpKind : I32EnumAttr<
+    "UnaryOpKind",
+    "unary operation kind",
+    [UnaryOpKind_Inc,
+     UnaryOpKind_Dec,
+     UnaryOpKind_Plus,
+     UnaryOpKind_Minus,
+     UnaryOpKind_Not,
+     ]> {
+  let cppNamespace = "::cir";
+}
+
+// FIXME: Pure won't work when we add overloading.
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erichkeane wrote:

Would love to see the answer for this from @lanza  and @bcardosolopes 

https://github.com/llvm/llvm-project/pull/131369