don't inhibit random field reordering on repr(packed(1))

Author: RalfJung

compiler/rustc_abi/src/lib.rs

@@ -138,14 +138,8 @@ impl ReprOptions {
     }
 
     /// Returns `true` if this `#[repr()]` should inhibit struct field reordering
-    /// optimizations, such as with `repr(C)`, `repr(packed(1))`, or `repr(<int>)`.
+    /// optimizations, such as with `repr(C)` or `repr(<int>)`.
     pub fn inhibit_struct_field_reordering_opt(&self) -> bool {
-        if let Some(pack) = self.pack {
-            if pack.bytes() == 1 {
-                return true;
-            }
-        }
-
         self.flags.intersects(ReprFlags::IS_UNOPTIMISABLE) || self.int.is_some()
     }