Remove extern crate rustc_middle from numerous crates.

compiler/rustc_mir_dataflow/src/elaborate_drops.rs

@@ -2,6 +2,7 @@ use rustc_hir::lang_items::LangItem;
 use rustc_index::Idx;
 use rustc_middle::mir::patch::MirPatch;
 use rustc_middle::mir::*;
+use rustc_middle::span_bug;
 use rustc_middle::traits::Reveal;
 use rustc_middle::ty::util::IntTypeExt;
 use rustc_middle::ty::GenericArgsRef;

compiler/rustc_mir_dataflow/src/framework/engine.rs

@@ -13,6 +13,7 @@ use rustc_data_structures::work_queue::WorkQueue;
 use rustc_graphviz as dot;
 use rustc_hir::def_id::DefId;
 use rustc_index::{Idx, IndexVec};
+use rustc_middle::bug;
 use rustc_middle::mir::{self, traversal, BasicBlock};
 use rustc_middle::mir::{create_dump_file, dump_enabled};
 use rustc_middle::ty::print::with_no_trimmed_paths;

compiler/rustc_mir_dataflow/src/impls/initialized.rs

@@ -1,5 +1,6 @@
 use rustc_index::bit_set::{BitSet, ChunkedBitSet};
 use rustc_index::Idx;
+use rustc_middle::bug;
 use rustc_middle::mir::{self, Body, CallReturnPlaces, Location, TerminatorEdges};
 use rustc_middle::ty::{self, TyCtxt};
 

compiler/rustc_mir_dataflow/src/lib.rs

@@ -6,8 +6,6 @@
 
 #[macro_use]
 extern crate tracing;
-#[macro_use]
-extern crate rustc_middle;
 
 use rustc_middle::ty;
 

compiler/rustc_mir_dataflow/src/move_paths/builder.rs

@@ -2,6 +2,7 @@ use rustc_index::IndexVec;
 use rustc_middle::mir::tcx::{PlaceTy, RvalueInitializationState};
 use rustc_middle::mir::*;
 use rustc_middle::ty::{self, Ty, TyCtxt, TypeVisitableExt};
+use rustc_middle::{bug, span_bug};
 use smallvec::{smallvec, SmallVec};
 
 use std::mem;

compiler/rustc_mir_dataflow/src/value_analysis.rs

@@ -40,6 +40,7 @@ use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::stack::ensure_sufficient_stack;
 use rustc_index::bit_set::BitSet;
 use rustc_index::{IndexSlice, IndexVec};
+use rustc_middle::bug;
 use rustc_middle::mir::visit::{MutatingUseContext, PlaceContext, Visitor};
 use rustc_middle::mir::*;
 use rustc_middle::ty::{self, Ty, TyCtxt};