Rollup merge of #122811 - nnethercote:mv-SourceMap-init, r=WaffleLapkin

Move `SourceMap` initialization

So it happens at the same time as `SessionGlobals` initialization, rather than shortly afterward.

r? `@WaffleLapkin`

clippy_lints/src/doc/needless_doctest_main.rs

@@ -38,7 +38,7 @@ pub fn check(
     // of all `#[test]` attributes in not ignored code examples
     fn check_code_sample(code: String, edition: Edition, ignore: bool) -> (bool, Vec<Range<usize>>) {
         rustc_driver::catch_fatal_errors(|| {
-            rustc_span::create_session_globals_then(edition, || {
+            rustc_span::create_session_globals_then(edition, None, || {
                 let mut test_attr_spans = vec![];
                 let filename = FileName::anon_source_code(&code);