Remove extern crate rustc_middle from rustc_mir_transform.

compiler/rustc_mir_transform/src/coverage/counters.rs

@@ -4,6 +4,7 @@ use rustc_data_structures::captures::Captures;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::graph::DirectedGraph;
 use rustc_index::IndexVec;
+use rustc_middle::bug;
 use rustc_middle::mir::coverage::{CounterId, CovTerm, Expression, ExpressionId, Op};
 
 use crate::coverage::graph::{BasicCoverageBlock, CoverageGraph, TraverseCoverageGraphWithLoops};

compiler/rustc_mir_transform/src/coverage/graph.rs

@@ -4,6 +4,7 @@ use rustc_data_structures::graph::dominators::{self, Dominators};
 use rustc_data_structures::graph::{self, DirectedGraph, StartNode};
 use rustc_index::bit_set::BitSet;
 use rustc_index::IndexVec;
+use rustc_middle::bug;
 use rustc_middle::mir::{self, BasicBlock, Terminator, TerminatorKind};
 
 use std::cmp::Ordering;

compiler/rustc_mir_transform/src/coverage/spans.rs

@@ -1,3 +1,4 @@
+use rustc_middle::bug;
 use rustc_middle::mir;
 use rustc_span::{BytePos, Span};
 

compiler/rustc_mir_transform/src/coverage/spans/from_mir.rs

@@ -1,5 +1,6 @@
 use rustc_data_structures::captures::Captures;
 use rustc_data_structures::fx::FxHashSet;
+use rustc_middle::bug;
 use rustc_middle::mir::coverage::CoverageKind;
 use rustc_middle::mir::{
     self, AggregateKind, FakeReadCause, Rvalue, Statement, StatementKind, Terminator,

compiler/rustc_mir_transform/src/coverage/tests.rs

@@ -30,6 +30,7 @@ use super::graph::{self, BasicCoverageBlock};
 use itertools::Itertools;
 use rustc_data_structures::graph::{DirectedGraph, Successors};
 use rustc_index::{Idx, IndexVec};
+use rustc_middle::bug;
 use rustc_middle::mir::*;
 use rustc_middle::ty;
 use rustc_span::{BytePos, Pos, Span, DUMMY_SP};