Address comments around bfc arena  (#3460)
Address comments around bfc arena  (#3460)

* rename setting

* todo comments

* fix build

Co-authored-by: Ethan Tao <c67d3e88e77139ff98c0a8718913515710b4737d@microsoft.com>
microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime