[mlir][NFC] Add explicit "::mlir" namespace to tblgen generated code

Reviewed By: lattner, ftynse

Differential Revision: https://reviews.llvm.org/D109223

Author: Vladislav Vinogradov

mlir/include/mlir/IR/OpBase.td

@@ -1582,7 +1582,8 @@ def SymbolRefAttr : Attr<CPred<"$_self.isa<::mlir::SymbolRefAttr>()">,
   let storageType = [{ ::mlir::SymbolRefAttr }];
   let returnType = [{ ::mlir::SymbolRefAttr }];
   let valueType = NoneType;
-  let constBuilderCall = "SymbolRefAttr::get($_builder.getContext(), $0)";
+  let constBuilderCall =
+    "::mlir::SymbolRefAttr::get($_builder.getContext(), $0)";
   let convertFromStorage = "$_self";
 }
 
@@ -1591,7 +1592,8 @@ def FlatSymbolRefAttr : Attr<CPred<"$_self.isa<::mlir::FlatSymbolRefAttr>()">,
   let storageType = [{ ::mlir::FlatSymbolRefAttr }];
   let returnType = [{ ::llvm::StringRef }];
   let valueType = NoneType;
-  let constBuilderCall = "SymbolRefAttr::get($_builder.getContext(), $0)";
+  let constBuilderCall =
+    "::mlir::SymbolRefAttr::get($_builder.getContext(), $0)";
   let convertFromStorage = "$_self.getValue()";
 }