Minimize `pub` usage in `source_map.rs`.

Most notably, this commit changes the `pub use crate::*;` in that file
to `use crate::*;`. This requires a lot of `use` items in other crates
to be adjusted, because everything defined within `rustc_span::*` was
also available via `rustc_span::source_map::*`, which is bizarre.

The commit also removes `SourceMap::span_to_relative_line_string`, which
is unused.

1 files changed, 2 insertions, 1 deletions

diff --git a/compiler/rustc_interface/src/interface.rs b/compiler/rustc_interface/src/interface.rs
index ffdc05526f2..8fb6216f381 100644
--- a/compiler/rustc_interface/src/interface.rs
+++ b/compiler/rustc_interface/src/interface.rs
@@ -21,8 +21,9 @@ use rustc_session::config::{
 use rustc_session::filesearch::sysroot_candidates;
 use rustc_session::parse::ParseSess;
 use rustc_session::{lint, CompilerIO, EarlyErrorHandler, Session};
-use rustc_span::source_map::{FileLoader, FileName};
+use rustc_span::source_map::FileLoader;
 use rustc_span::symbol::sym;
+use rustc_span::FileName;
 use std::path::PathBuf;
 use std::result;
 use std::sync::Arc;