Rollup merge of #34391 - pyjarrett:master, r=jseyfried

Improves organization of driver includes.

Minor reordering of use's in librustc_driver/driver.rs

- puts her::lower::lower_create with it's siblings
- groups link and write of rustc_trans::back

src/librustc_driver/driver.rs

@@ -12,6 +12,7 @@ use rustc::dep_graph::DepGraph;
 use rustc::hir;
 use rustc::hir::{map as hir_map, FreevarMap, TraitMap};
 use rustc::hir::def::DefMap;
+use rustc::hir::lowering::lower_crate;
 use rustc_mir as mir;
 use rustc::mir::mir_map::MirMap;
 use rustc::session::{Session, CompileResult, compile_result_from_err_count};
@@ -30,14 +31,12 @@ use rustc_resolve as resolve;
 use rustc_metadata::macro_import;
 use rustc_metadata::creader::read_local_crates;
 use rustc_metadata::cstore::CStore;
-use rustc_trans::back::link;
-use rustc_trans::back::write;
+use rustc_trans::back::{link, write};
 use rustc_trans as trans;
 use rustc_typeck as typeck;
 use rustc_privacy;
 use rustc_plugin::registry::Registry;
 use rustc_plugin as plugin;
-use rustc::hir::lowering::lower_crate;
 use rustc_passes::{ast_validation, no_asm, loops, consts, rvalues, static_recursion};
 use rustc_const_eval::check_match;
 use super::Compilation;