[CIR] Separate CIR EnumAttr definitions to be includable without the rest of attributes

This mirrors incubator change from llvm/clangir#1733

Author: xlauko

clang/include/clang/CIR/Dialect/IR/CIRAttrs.td

@@ -14,10 +14,10 @@
 #define CLANG_CIR_DIALECT_IR_CIRATTRS_TD
 
 include "mlir/IR/BuiltinAttributeInterfaces.td"
-include "mlir/IR/EnumAttr.td"
 
-include "clang/CIR/Dialect/IR/CIRDialect.td"
 include "clang/CIR/Dialect/IR/CIRAttrConstraints.td"
+include "clang/CIR/Dialect/IR/CIRDialect.td"
+include "clang/CIR/Dialect/IR/CIREnumAttr.td"
 
 //===----------------------------------------------------------------------===//
 // CIR Attrs
@@ -42,21 +42,6 @@ class CIR_TypedAttr<string name, string attrMnemonic, list<Trait> traits = []>
   let assemblyFormat = [{}];
 }
 
-class CIR_I32EnumAttr<string name, string summary, list<I32EnumAttrCase> cases>
-    : I32EnumAttr<name, summary, cases> {
-  let cppNamespace = "::cir";
-}
-
-class CIR_I64EnumAttr<string name, string summary, list<I64EnumAttrCase> cases>
-    : I64EnumAttr<name, summary, cases> {
-  let cppNamespace = "::cir";
-}
-
-class CIR_EnumAttr<EnumAttrInfo info, string name = "", list<Trait> traits = []>
-    : EnumAttr<CIR_Dialect, info, name, traits> {
-  let assemblyFormat = "`<` $value `>`";
-}
-
 class CIRUnitAttr<string name, string attrMnemonic, list<Trait> traits = []>
     : CIR_Attr<name, attrMnemonic, traits> {
   let returnType = "bool";

clang/include/clang/CIR/Dialect/IR/CIREnumAttr.td

@@ -0,0 +1,38 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the CIR dialect enum base classes
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef CLANG_CIR_DIALECT_IR_CIRENUMATTR_TD
+#define CLANG_CIR_DIALECT_IR_CIRENUMATTR_TD
+
+include "mlir/IR/EnumAttr.td"
+
+class CIR_I32EnumAttr<string name, string summary, list<I32EnumAttrCase> cases>
+    : I32EnumAttr<name, summary, cases> {
+  let cppNamespace = "::cir";
+}
+
+class CIR_I64EnumAttr<string name, string summary, list<I64EnumAttrCase> cases>
+    : I64EnumAttr<name, summary, cases> {
+  let cppNamespace = "::cir";
+}
+
+class CIR_EnumAttr<EnumAttrInfo info, string name = "", list<Trait> traits = []>
+    : EnumAttr<CIR_Dialect, info, name, traits> {
+  let assemblyFormat = "`<` $value `>`";
+}
+
+class CIR_DefaultValuedEnumParameter<EnumAttrInfo info, string value = "">
+    : EnumParameter<info> {
+  let defaultValue = value;
+}
+
+#endif // CLANG_CIR_DIALECT_IR_CIRENUMATTR_TD