Grammar nit

Author: oli-obk

src/librustc_mir/transform/promote_consts.rs

@@ -333,8 +333,8 @@ impl<'a, 'tcx> Promoter<'a, 'tcx> {
                             mem::replace(&mut args[index], operand)
                         }
                         // We expected a `TerminatorKind::Call` for which we'd like to promote an
-                        // argument. Since `qualify_consts` saw a `TerminatorKind::Call` here, but
-                        // we are seeing a `Goto`, that means that the `promote_temps` method
+                        // argument. `qualify_consts` saw a `TerminatorKind::Call` here, but
+                        // we are seeing a `Goto`. That means that the `promote_temps` method
                         // already promoted this call away entirely. This case occurs when calling
                         // a function requiring a constant argument and as that constant value
                         // providing a value whose computation contains another call to a function