[MLIR][ODS] Check hasProperties when generating populateDefaultAttrs (#78525)

Currently ODS generates `populateDefaultAttrs` or
`populateDefaultProperties` based on whether the dialect opted into
usePropertiesForAttributes. But since individual ops might get opted
into using properties (as long as it has one property), it should
actually just check whether the op itself uses properties. Otherwise
`populateDefaultAttrs` will overwrite existing attrs inside properties
when creating an op. Understandably this becomes moot once everything
switches over to using properties, but this fixes it for now.

This PR makes ODS generate `populateDefaultProperties` as long as the op
itself uses properties.

Author: zyx-billy

mlir/test/mlir-tblgen/op-attribute.td

@@ -173,6 +173,8 @@ def AOp : NS_Op<"a_op", []> {
 // DEF:        ::llvm::ArrayRef<::mlir::NamedAttribute> attributes
 // DEF:      odsState.addAttributes(attributes);
 
+// DEF:      void AOp::populateDefaultAttrs
+
 // Test the above but with prefix.
 
 def Test2_Dialect : Dialect {
@@ -287,6 +289,17 @@ def AgetOp : Op<Test2_Dialect, "a_get_op", []> {
 // DEF:        ::llvm::ArrayRef<::mlir::NamedAttribute> attributes
 // DEF:      odsState.addAttributes(attributes);
 
+// Test the above but using properties.
+def ApropOp : NS_Op<"a_prop_op", []> {
+  let arguments = (ins
+      Property<"unsigned">:$aAttr,
+      DefaultValuedAttr<SomeAttr, "4.2">:$bAttr
+  );
+}
+
+// DEF-LABEL: ApropOp definitions
+// DEF:       void ApropOp::populateDefaultProperties
+
 def SomeTypeAttr : TypeAttrBase<"SomeType", "some type attribute">;
 
 def BOp : NS_Op<"b_op", []> {

mlir/tools/mlir-tblgen/OpDefinitionsGen.cpp

@@ -2506,7 +2506,7 @@ void OpEmitter::genPopulateDefaultAttributes() {
       }))
     return;
 
-  if (op.getDialect().usePropertiesForAttributes()) {
+  if (emitHelper.hasProperties()) {
     SmallVector<MethodParameter> paramList;
     paramList.emplace_back("::mlir::OperationName", "opName");
     paramList.emplace_back("Properties &", "properties");