[clang-format][NFC] Make InsertNewlineAtEOF a little more efficient

Author: owenca

clang/lib/Format/TokenAnnotator.cpp

@@ -1414,10 +1414,6 @@ class AnnotatingParser {
         Tok->setType(TT_TrailingReturnArrow);
       }
       break;
-    case tok::eof:
-      if (Style.InsertNewlineAtEOF && Tok->NewlinesBefore == 0)
-        Tok->NewlinesBefore = 1;
-      break;
     default:
       break;
     }
@@ -3244,8 +3240,14 @@ void TokenAnnotator::annotate(AnnotatedLine &Line) {
   else if (Line.startsWith(TT_ObjCProperty))
     Line.Type = LT_ObjCProperty;
 
-  Line.First->SpacesRequiredBefore = 1;
-  Line.First->CanBreakBefore = Line.First->MustBreakBefore;
+  auto *First = Line.First;
+  First->SpacesRequiredBefore = 1;
+  First->CanBreakBefore = First->MustBreakBefore;
+
+  if (First->is(tok::eof) && First->NewlinesBefore == 0 &&
+      Style.InsertNewlineAtEOF) {
+    First->NewlinesBefore = 1;
+  }
 }
 
 // This function heuristically determines whether 'Current' starts the name of a