Eliminate the `SessionGlobals` from `librustc_ast`.

By moving `{known,used}_attrs` from `SessionGlobals` to `Session`. This
means they are accessed via the `Session`, rather than via TLS. A few
`Attr` methods and `librustc_ast` functions are now methods of
`Session`.

All of this required passing a `Session` to lots of functions that didn't
already have one. Some of these functions also had arguments removed, because
those arguments could be accessed directly via the `Session` argument.

`contains_feature_attr()` was dead, and is removed.

Some functions were moved from `librustc_ast` elsewhere because they now need
to access `Session`, which isn't available in that crate.
- `entry_point_type()` --> `librustc_builtin_macros`
- `global_allocator_spans()` --> `librustc_metadata`
- `is_proc_macro_attr()` --> `Session`

2 files changed, 2 insertions, 2 deletions

diff --git a/src/librustc_expand/parse/lexer/tests.rs b/src/librustc_expand/parse/lexer/tests.rs
index 0b51abf385f..87184444283 100644
--- a/src/librustc_expand/parse/lexer/tests.rs
+++ b/src/librustc_expand/parse/lexer/tests.rs
@@ -1,12 +1,12 @@
 use rustc_ast::ast::AttrStyle;
 use rustc_ast::token::{self, CommentKind, Token, TokenKind};
-use rustc_ast::with_default_session_globals;
 use rustc_data_structures::sync::Lrc;
 use rustc_errors::{emitter::EmitterWriter, Handler};
 use rustc_parse::lexer::StringReader;
 use rustc_session::parse::ParseSess;
 use rustc_span::source_map::{FilePathMapping, SourceMap};
 use rustc_span::symbol::Symbol;
+use rustc_span::with_default_session_globals;
 use rustc_span::{BytePos, Span};
 
 use std::io;
diff --git a/src/librustc_expand/parse/tests.rs b/src/librustc_expand/parse/tests.rs
index d6301c8a82e..5c9116b2f13 100644
--- a/src/librustc_expand/parse/tests.rs
+++ b/src/librustc_expand/parse/tests.rs
@@ -5,13 +5,13 @@ use rustc_ast::ptr::P;
 use rustc_ast::token::{self, Token};
 use rustc_ast::tokenstream::{DelimSpan, TokenStream, TokenTree};
 use rustc_ast::visit;
-use rustc_ast::with_default_session_globals;
 use rustc_ast_pretty::pprust::item_to_string;
 use rustc_errors::PResult;
 use rustc_parse::new_parser_from_source_str;
 use rustc_session::parse::ParseSess;
 use rustc_span::source_map::FilePathMapping;
 use rustc_span::symbol::{kw, sym, Symbol};
+use rustc_span::with_default_session_globals;
 use rustc_span::{BytePos, FileName, Pos, Span};
 
 use std::path::PathBuf;