use Lrc instead of the aliased type Arc directly

Author: y21

clippy_lints/src/attrs/mixed_attributes_style.rs

@@ -2,10 +2,10 @@ use super::MIXED_ATTRIBUTES_STYLE;
 use clippy_utils::diagnostics::span_lint;
 use rustc_ast::{AttrKind,AttrStyle,Attribute};
 use rustc_data_structures::fx::FxHashSet;
+use rustc_data_structures::sync::Lrc;
 use rustc_lint::{LateContext,LintContext};
 use rustc_span::source_map::SourceMap;
 use rustc_span::{SourceFile,Span,Symbol};
-use std::sync::Arc;
 
 #[derive(Hash,PartialEq,Eq)]
 enumSimpleAttrKind{
@@ -79,7 +79,7 @@ fn lint_mixed_attrs(cx: &LateContext<'_>, attrs: &[Attribute]) {
 );
 }
 
-fnattr_in_same_src_as_item(source_map:&SourceMap,item_src:&Arc<SourceFile>,attr_span:Span) -> bool{
+fnattr_in_same_src_as_item(source_map:&SourceMap,item_src:&Lrc<SourceFile>,attr_span:Span) -> bool{
 let attr_src = source_map.lookup_source_file(attr_span.lo());
-Arc::ptr_eq(item_src,&attr_src)
+Lrc::ptr_eq(item_src,&attr_src)
 }