Remove unused abs_path method from rustc_span::source_map::FileLoader
Remove unused abs_path method from rustc_span::source_map::FileLoader

aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust