Rollup merge of #60928 - TheSirC:fix/60229, r=eddyb

Changes the type `mir::Mir` into `mir::Body`

Fixes part 1 of #60229 (previously attempted in #60242).

I stumbled upon the issue and it seems that the previous attempt at solving it was not merged. This is a second try more up-to-date.

The commit should have changed comments as well.
At the time of writting, it passes the tidy and check tool.

src/librustc_codegen_ssa/mir/analyze.rs

@@ -18,7 +18,7 @@ pub fn non_ssa_locals<'a, 'tcx: 'a, Bx: BuilderMethods<'a, 'tcx>>(
     let mir = fx.mir;
     let mut analyzer = LocalAnalyzer::new(fx);
 
-    analyzer.visit_mir(mir);
+    analyzer.visit_body(mir);
 
     for (index, ty) in mir.local_decls.iter().map(|l| l.ty).enumerate() {
         let ty = fx.monomorphize(&ty);
@@ -272,9 +272,9 @@ impl CleanupKind {
     }
 }
 
-pub fn cleanup_kinds<'a, 'tcx>(mir: &mir::Mir<'tcx>) -> IndexVec<mir::BasicBlock, CleanupKind> {
+pub fn cleanup_kinds<'a, 'tcx>(mir: &mir::Body<'tcx>) -> IndexVec<mir::BasicBlock, CleanupKind> {
     fn discover_masters<'tcx>(result: &mut IndexVec<mir::BasicBlock, CleanupKind>,
-                              mir: &mir::Mir<'tcx>) {
+                              mir: &mir::Body<'tcx>) {
         for (bb, data) in mir.basic_blocks().iter_enumerated() {
             match data.terminator().kind {
                 TerminatorKind::Goto { .. } |
@@ -304,7 +304,7 @@ pub fn cleanup_kinds<'a, 'tcx>(mir: &mir::Mir<'tcx>) -> IndexVec<mir::BasicBlock
     }
 
     fn propagate<'tcx>(result: &mut IndexVec<mir::BasicBlock, CleanupKind>,
-                       mir: &mir::Mir<'tcx>) {
+                       mir: &mir::Body<'tcx>) {
         let mut funclet_succs = IndexVec::from_elem(None, mir.basic_blocks());
 
         let mut set_successor = |funclet: mir::BasicBlock, succ| {

src/librustc_codegen_ssa/mir/mod.rs

@@ -1,6 +1,6 @@
 use rustc::ty::{self, Ty, TypeFoldable, UpvarSubsts};
 use rustc::ty::layout::{TyLayout, HasTyCtxt, FnTypeExt};
-use rustc::mir::{self, Mir};
+use rustc::mir::{self, Body};
 use rustc::session::config::DebugInfo;
 use rustc_mir::monomorphize::Instance;
 use rustc_target::abi::call::{FnType, PassMode, IgnoreMode};
@@ -27,7 +27,7 @@ use self::operand::{OperandRef, OperandValue};
 pub struct FunctionCx<'a, 'tcx: 'a, Bx: BuilderMethods<'a, 'tcx>> {
     instance: Instance<'tcx>,
 
-    mir: &'a mir::Mir<'tcx>,
+    mir: &'a mir::Body<'tcx>,
 
     debug_context: FunctionDebugContext<Bx::DIScope>,
 
@@ -196,7 +196,7 @@ impl<'a, 'tcx: 'a, V: CodegenObject> LocalRef<'tcx, V> {
 pub fn codegen_mir<'a, 'tcx: 'a, Bx: BuilderMethods<'a, 'tcx>>(
     cx: &'a Bx::CodegenCx,
     llfn: Bx::Value,
-    mir: &'a Mir<'tcx>,
+    mir: &'a Body<'tcx>,
     instance: Instance<'tcx>,
     sig: ty::FnSig<'tcx>,
 ) {
@@ -360,7 +360,7 @@ pub fn codegen_mir<'a, 'tcx: 'a, Bx: BuilderMethods<'a, 'tcx>>(
 }
 
 fn create_funclets<'a, 'tcx: 'a, Bx: BuilderMethods<'a, 'tcx>>(
-    mir: &'a Mir<'tcx>,
+    mir: &'a Body<'tcx>,
     bx: &mut Bx,
     cleanup_kinds: &IndexVec<mir::BasicBlock, CleanupKind>,
     block_bxs: &IndexVec<mir::BasicBlock, Bx::BasicBlock>)

src/librustc_codegen_ssa/traits/debuginfo.rs

@@ -22,12 +22,12 @@ pub trait DebugInfoMethods<'tcx>: BackendTypes {
         instance: Instance<'tcx>,
         sig: ty::FnSig<'tcx>,
         llfn: Self::Value,
-        mir: &mir::Mir<'_>,
+        mir: &mir::Body<'_>,
     ) -> FunctionDebugContext<Self::DIScope>;
 
     fn create_mir_scopes(
         &self,
-        mir: &mir::Mir<'_>,
+        mir: &mir::Body<'_>,
         debug_context: &mut FunctionDebugContext<Self::DIScope>,
     ) -> IndexVec<mir::SourceScope, MirDebugScope<Self::DIScope>>;
     fn extend_scope_to_file(