Replace absolute paths with relative ones

Modern compilers allow reaching external crates
like std or core via relative paths in modules
outside of lib.rs and main.rs.

compiler/rustc_codegen_ssa/src/back/write.rs

@@ -1175,7 +1175,7 @@ fn start_executing_work<B: ExtraBackendMethods>(
     // necessary. There's already optimizations in place to avoid sending work
     // back to the coordinator if LTO isn't requested.
     return thread::spawn(move || {
-        let max_workers = ::num_cpus::get();
+        let max_workers = num_cpus::get();
         let mut worker_id_counter = 0;
         let mut free_worker_ids = Vec::new();
         let mut get_worker_id = |free_worker_ids: &mut Vec<usize>| {

compiler/rustc_codegen_ssa/src/base.rs

@@ -695,7 +695,7 @@ pub fn codegen_crate<B: ExtraBackendMethods>(
         total_codegen_time.into_inner(),
     );
 
-    ::rustc_incremental::assert_module_sources::assert_module_sources(tcx);
+    rustc_incremental::assert_module_sources::assert_module_sources(tcx);
 
     symbol_names_test::report_symbol_names(tcx);
 
@@ -754,8 +754,8 @@ impl<B: ExtraBackendMethods> Drop for AbortCodegenOnDrop<B> {
 }
 
 fn finalize_tcx(tcx: TyCtxt<'_>) {
-    tcx.sess.time("assert_dep_graph", || ::rustc_incremental::assert_dep_graph(tcx));
-    tcx.sess.time("serialize_dep_graph", || ::rustc_incremental::save_dep_graph(tcx));
+    tcx.sess.time("assert_dep_graph", || rustc_incremental::assert_dep_graph(tcx));
+    tcx.sess.time("serialize_dep_graph", || rustc_incremental::save_dep_graph(tcx));
 
     // We assume that no queries are run past here. If there are new queries
     // after this point, they'll show up as "<unknown>" in self-profiling data.

compiler/rustc_codegen_ssa/src/traits/mod.rs

@@ -85,7 +85,7 @@ impl<'tcx, T> CodegenMethods<'tcx> for T where
 }
 
 pub trait HasCodegen<'tcx>:
-    Backend<'tcx> + ::std::ops::Deref<Target = <Self as HasCodegen<'tcx>>::CodegenCx>
+    Backend<'tcx> + std::ops::Deref<Target = <Self as HasCodegen<'tcx>>::CodegenCx>
 {
     type CodegenCx: CodegenMethods<'tcx>
         + BackendTypes<