Fix validation and linting of injected MIR

Reevaluate `body.should_skip()` after updating the MIR phase to ensure
that injected MIR is processed correctly.

Update a few custom MIR tests that were ill-formed for the injected
phase.

Author: tmiasko

compiler/rustc_mir_transform/src/pass_manager.rs

@@ -109,14 +109,15 @@ fn run_passes_inner<'tcx>(
     phase_change: Option<MirPhase>,
     validate_each: bool,
 ) {
-    let lint = tcx.sess.opts.unstable_opts.lint_mir & !body.should_skip();
-    let validate = validate_each & tcx.sess.opts.unstable_opts.validate_mir & !body.should_skip();
     let overridden_passes = &tcx.sess.opts.unstable_opts.mir_enable_passes;
     trace!(?overridden_passes);
 
     let prof_arg = tcx.sess.prof.enabled().then(|| format!("{:?}", body.source.def_id()));
 
     if !body.should_skip() {
+        let validate = validate_each & tcx.sess.opts.unstable_opts.validate_mir;
+        let lint = tcx.sess.opts.unstable_opts.lint_mir;
+
         for pass in passes {
             let name = pass.name();
 
@@ -162,7 +163,12 @@ fn run_passes_inner<'tcx>(
         body.pass_count = 0;
 
         dump_mir_for_phase_change(tcx, body);
-        if validate || new_phase == MirPhase::Runtime(RuntimePhase::Optimized) {
+
+        let validate =
+            (validate_each & tcx.sess.opts.unstable_opts.validate_mir & !body.should_skip())
+                || new_phase == MirPhase::Runtime(RuntimePhase::Optimized);
+        let lint = tcx.sess.opts.unstable_opts.lint_mir & !body.should_skip();
+        if validate {
             validate_body(tcx, body, format!("after phase change to {}", new_phase.name()));
         }
         if lint {

tests/mir-opt/copy-prop/custom_move_arg.f.CopyProp.panic-unwind.diff

@@ -8,14 +8,14 @@
 
       bb0: {
 -         _2 = _1;
--         _0 = opaque::<NotCopy>(move _1) -> [return: bb1, unwind continue];
-+         _0 = opaque::<NotCopy>(_1) -> [return: bb1, unwind continue];
+-         _0 = opaque::<NotCopy>(move _1) -> [return: bb1, unwind unreachable];
++         _0 = opaque::<NotCopy>(_1) -> [return: bb1, unwind unreachable];
       }
 
       bb1: {
 -         _3 = move _2;
--         _0 = opaque::<NotCopy>(_3) -> [return: bb2, unwind continue];
-+         _0 = opaque::<NotCopy>(_1) -> [return: bb2, unwind continue];
+-         _0 = opaque::<NotCopy>(_3) -> [return: bb2, unwind unreachable];
++         _0 = opaque::<NotCopy>(_1) -> [return: bb2, unwind unreachable];
       }
 
       bb2: {

tests/mir-opt/copy-prop/custom_move_arg.rs

@@ -10,15 +10,15 @@ use core::intrinsics::mir::*;
 struct NotCopy(bool);
 
 // EMIT_MIR custom_move_arg.f.CopyProp.diff
-#[custom_mir(dialect = "analysis", phase = "post-cleanup")]
+#[custom_mir(dialect = "runtime")]
 fn f(_1: NotCopy) {
     mir!({
         let _2 = _1;
-        Call(RET = opaque(Move(_1)), ReturnTo(bb1), UnwindContinue())
+        Call(RET = opaque(Move(_1)), ReturnTo(bb1), UnwindUnreachable())
     }
     bb1 = {
         let _3 = Move(_2);
-        Call(RET = opaque(_3), ReturnTo(bb2), UnwindContinue())
+        Call(RET = opaque(_3), ReturnTo(bb2), UnwindUnreachable())
     }
     bb2 = {
         Return()

tests/mir-opt/copy-prop/move_projection.f.CopyProp.panic-unwind.diff

@@ -9,13 +9,13 @@
       bb0: {
 -         _2 = _1;
 -         _3 = move (_2.0: u8);
--         _0 = opaque::<Foo>(move _1) -> [return: bb1, unwind continue];
+-         _0 = opaque::<Foo>(move _1) -> [return: bb1, unwind unreachable];
 +         _3 = (_1.0: u8);
-+         _0 = opaque::<Foo>(_1) -> [return: bb1, unwind continue];
++         _0 = opaque::<Foo>(_1) -> [return: bb1, unwind unreachable];
       }
 
       bb1: {
-          _0 = opaque::<u8>(move _3) -> [return: bb2, unwind continue];
+          _0 = opaque::<u8>(move _3) -> [return: bb2, unwind unreachable];
       }
 
       bb2: {

tests/mir-opt/copy-prop/move_projection.rs

@@ -11,17 +11,17 @@ fn opaque(_: impl Sized) -> bool { true }
 
 struct Foo(u8);
 
-#[custom_mir(dialect = "analysis", phase = "post-cleanup")]
+#[custom_mir(dialect = "runtime")]
 fn f(a: Foo) -> bool {
     mir!(
         {
             let b = a;
             // This is a move out of a copy, so must become a copy of `a.0`.
             let c = Move(b.0);
-            Call(RET = opaque(Move(a)), ReturnTo(bb1), UnwindContinue())
+            Call(RET = opaque(Move(a)), ReturnTo(bb1), UnwindUnreachable())
         }
         bb1 = {
-            Call(RET = opaque(Move(c)), ReturnTo(ret), UnwindContinue())
+            Call(RET = opaque(Move(c)), ReturnTo(ret), UnwindUnreachable())
         }
         ret = {
             Return()