Auto merge of #69916 - oli-obk:mir_bless, r=eddyb

Enable blessing of mir opt tests

cc @rust-lang/wg-mir-opt
cc @RalfJung

Long overdue, but now you can finally just add a

```rust
// EMIT_MIR rustc.function_name.MirPassName.before.mir
```

(or `after.mir` since most of the time you want to know the MIR after a pass). A `--bless` invocation will automatically create the files for you.

I suggest we do this for all mir opt tests that have all of the MIR in their source anyway

If you use `rustc.function.MirPass.diff` you only get the diff that the MIR pass causes on the MIR.

Fixes #67865

1 files changed, 2 insertions, 2 deletions

diff --git a/src/librustc_data_structures/sorted_map.rs b/src/librustc_data_structures/sorted_map.rs
index 8c42b74b85a..652268dcee8 100644
--- a/src/librustc_data_structures/sorted_map.rs
+++ b/src/librustc_data_structures/sorted_map.rs
@@ -110,13 +110,13 @@ impl<K: Ord, V> SortedMap<K, V> {
 
     /// Iterate over the keys, sorted
     #[inline]
-    pub fn keys(&self) -> impl Iterator<Item = &K> + ExactSizeIterator {
+    pub fn keys(&self) -> impl Iterator<Item = &K> + ExactSizeIterator + DoubleEndedIterator {
         self.data.iter().map(|&(ref k, _)| k)
     }
 
     /// Iterate over values, sorted by key
     #[inline]
-    pub fn values(&self) -> impl Iterator<Item = &V> + ExactSizeIterator {
+    pub fn values(&self) -> impl Iterator<Item = &V> + ExactSizeIterator + DoubleEndedIterator {
         self.data.iter().map(|&(_, ref v)| v)
     }