Remove seemingly unused SymbolLink constEnumReferenced (microsoft#58377)

Author: weswigham

src/compiler/checker.ts

@@ -4291,15 +4291,6 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
         }
     }
 
-    // Aliases that resolve to const enums are not marked as referenced because they are not emitted,
-    // but their usage in value positions must be tracked to determine if the import can be type-only.
-    function markConstEnumAliasAsReferenced(symbol: Symbol) {
-        const links = getSymbolLinks(symbol);
-        if (!links.constEnumReferenced) {
-            links.constEnumReferenced = true;
-        }
-    }
-
     // This function is only for imports with entity names
     function getSymbolOfPartOfRightHandSideOfImportEquals(entityName: EntityName, dontResolveAlias?: boolean): Symbol | undefined {
         // There are three things we might try to look for. In the following examples,
@@ -29202,9 +29193,6 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                 ) {
                     markAliasSymbolAsReferenced(symbol);
                 }
-                else {
-                    markConstEnumAliasAsReferenced(symbol);
-                }
             }
         }
     }

src/compiler/types.ts

@@ -5916,7 +5916,6 @@ export interface SymbolLinks {
     inferredClassSymbol?: Map<SymbolId, TransientSymbol>; // Symbol of an inferred ES5 constructor function
     mapper?: TypeMapper;                        // Type mapper for instantiation alias
     referenced?: boolean;                       // True if alias symbol has been referenced as a value that can be emitted
-    constEnumReferenced?: boolean;              // True if alias symbol resolves to a const enum and is referenced as a value ('referenced' will be false)
     containingType?: UnionOrIntersectionType;   // Containing union or intersection type for synthetic property
     leftSpread?: Symbol;                        // Left source for synthetic spread property
     rightSpread?: Symbol;                       // Right source for synthetic spread property