NFC: Silence two warnings for unused bufferization symbols in release mode.

mlir/lib/Dialect/Bufferization/Transforms/Bufferize.cpp

 private:
   /// A set of all erased ops.
   DenseSet<Operation *> &erasedOps;
 
   /// A set of all to_memref ops.
   DenseSet<Operation *> &toMemrefOps;
 
   /// The bufferization options.
+  /// Used for debug modes.
+  LLVM_ATTRIBUTE_UNUSED
   const BufferizationOptions &options;
 };
 } // namespace
 
 LogicalResult
 bufferization::bufferizeOp(Operation *op,
                            BufferizationState &bufferizationState) {
   const auto &options = bufferizationState.getOptions();

mlir/lib/Dialect/Bufferization/Transforms/OneShotModuleBufferize.cpp

 
 /// Get or create FuncAnalysisState.
 static FuncAnalysisState &getFuncAnalysisState(AnalysisState &state) {
   return state.getOrCreateDialectState<FuncAnalysisState>(
       func::FuncDialect::getDialectNamespace());
 }
 
 /// Return the state (phase) of analysis of the FuncOp.
+/// Used for debug modes.
+LLVM_ATTRIBUTE_UNUSED
 static FuncOpAnalysisState getFuncOpAnalysisState(const AnalysisState &state,
                                                   func::FuncOp funcOp) {
   const FuncAnalysisState &funcState = getFuncAnalysisState(state);
   auto it = funcState.analyzedFuncOps.find(funcOp);
   if (it == funcState.analyzedFuncOps.end())
     return FuncOpAnalysisState::NotAnalyzed;
   return it->second;
 }