Re-export more `rustc_span::symbol` things from `rustc_span`.

`rustc_span::symbol` defines some things that are re-exported from
`rustc_span`, such as `Symbol` and `sym`. But it doesn't re-export some
closely related things such as `Ident` and `kw`. So you can do `use
rustc_span::{Symbol, sym}` but you have to do `use
rustc_span::symbol::{Ident, kw}`, which is inconsistent for no good
reason.

This commit re-exports `Ident`, `kw`, and `MacroRulesNormalizedIdent`,
and changes many `rustc_span::symbol::` qualifiers in `compiler/` to
`rustc_span::`. This is a 200+ net line of code reduction, mostly
because many files with two `use rustc_span` items can be reduced to
one.

1 files changed, 1 insertions, 2 deletions

diff --git a/compiler/rustc_lint/src/dangling.rs b/compiler/rustc_lint/src/dangling.rs
index 10769b57a76..98b717a3070 100644
--- a/compiler/rustc_lint/src/dangling.rs
+++ b/compiler/rustc_lint/src/dangling.rs
@@ -4,8 +4,7 @@ use rustc_hir::intravisit::{FnKind, Visitor, walk_expr};
 use rustc_hir::{Block, Body, Expr, ExprKind, FnDecl, LangItem};
 use rustc_middle::ty::{Ty, TyCtxt};
 use rustc_session::{declare_lint, impl_lint_pass};
-use rustc_span::Span;
-use rustc_span::symbol::sym;
+use rustc_span::{Span, sym};
 
 use crate::lints::DanglingPointersFromTemporaries;
 use crate::{LateContext, LateLintPass};