EISW-176770 Fix argument parsing issue in mlir-src-sharder after command-line parser reset

When LLVM TableGen flags are globally appended, mlir-src-sharder fails with an unknown argument error because its command-line parser is reset during execution and does not retain the inherited flags.

Author: sramasit

mlir/tools/mlir-src-sharder/mlir-src-sharder.cpp

@@ -72,6 +72,12 @@ int main(int argc, char **argv) {
           "Name of the macro to be defined -- ignored by mlir-src-sharder"),
       llvm::cl::value_desc("macro name"), llvm::cl::Prefix);
 
+  // CMake/TableGen pass this flag, re-registering after ResetCommandLineParser
+  // avoids "unknown argument" errors.
+  llvm::cl::opt<bool> noWarnOnUnusedTemplateArg(
+      "no-warn-on-unused-template-args",
+      llvm::cl::desc("Disable unused template argument warnings."));
+
   llvm::InitLLVM y(argc, argv);
   llvm::cl::ParseCommandLineOptions(argc, argv);