Move `MirPass` to `rustc_mir_transform`.

Because that's now the only crate that uses it.

Moving stuff out of `rustc_middle` is always welcome.

I chose to use `impl crate::MirPass`/`impl crate::MirLint` (with
explicit `crate::`) everywhere because that's the only mention of
`MirPass`/`MirLint` used in all of these files. (Prior to this change,
`MirPass` was mostly imported via `use rustc_middle::mir::*` items.)

1 files changed, 2 insertions, 2 deletions

diff --git a/compiler/rustc_mir_transform/src/lib.rs b/compiler/rustc_mir_transform/src/lib.rs
index 63793c4f772..62e73ba2c8e 100644
--- a/compiler/rustc_mir_transform/src/lib.rs
+++ b/compiler/rustc_mir_transform/src/lib.rs
@@ -26,7 +26,7 @@ use rustc_hir::intravisit::{self, Visitor};
 use rustc_index::IndexVec;
 use rustc_middle::mir::{
     AnalysisPhase, Body, CallSource, ClearCrossCrate, ConstOperand, ConstQualifs, LocalDecl,
-    MirPass, MirPhase, Operand, Place, ProjectionElem, Promoted, RuntimePhase, Rvalue, SourceInfo,
+    MirPhase, Operand, Place, ProjectionElem, Promoted, RuntimePhase, Rvalue, SourceInfo,
     Statement, StatementKind, TerminatorKind, START_BLOCK,
 };
 use rustc_middle::ty::{self, TyCtxt, TypeVisitableExt};
@@ -40,7 +40,7 @@ use tracing::{debug, trace};
 #[macro_use]
 mod pass_manager;
 
-use pass_manager::{self as pm, Lint, MirLint, WithMinOptLevel};
+use pass_manager::{self as pm, Lint, MirLint, MirPass, WithMinOptLevel};
 
 mod abort_unwinding_calls;
 mod add_call_guards;