Fix -Z unpretty=everybody_loops

It turns out that this has not been working for who knows how long.
Previously:

```
pub fn h() { 1 + 2; }
```

After this change:

```
pub fn h() { loop {} }
```

This only affected the pass when run with the command line
pretty-printing option, so rustdoc was still replacing bodies with
`loop {}`.

1 files changed, 5 insertions, 2 deletions

diff --git a/src/librustc_session/config.rs b/src/librustc_session/config.rs
index 411a6eecbba..ff94a43c4f1 100644
--- a/src/librustc_session/config.rs
+++ b/src/librustc_session/config.rs
@@ -1826,6 +1826,7 @@ fn parse_pretty(
                 }
             }
         };
+        log::debug!("got unpretty option: {:?}", first);
         first
     }
 }
@@ -1954,9 +1955,11 @@ impl PpMode {
         use PpMode::*;
         use PpSourceMode::*;
         match *self {
-            PpmSource(PpmNormal | PpmEveryBodyLoops | PpmIdentified) => false,
+            PpmSource(PpmNormal | PpmIdentified) => false,
 
-            PpmSource(PpmExpanded | PpmExpandedIdentified | PpmExpandedHygiene)
+            PpmSource(
+                PpmExpanded | PpmEveryBodyLoops | PpmExpandedIdentified | PpmExpandedHygiene,
+            )
             | PpmHir(_)
             | PpmHirTree(_)
             | PpmMir