Remove whitespace

Author: weswigham

src/compiler/checker.ts

@@ -474,7 +474,6 @@ namespace ts {
         const identityRelation = createMap<RelationComparisonResult>();
         const enumRelation = createMap<boolean>();
 
-
         // This is for caching the result of getSymbolDisplayBuilder. Do not access directly.
         let _displayBuilder: SymbolDisplayBuilder;