Return early on intrinsics in couldContainTypeVariables

Author: jakebailey

src/compiler/checker.ts

@@ -24004,6 +24004,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
     // we perform type inference (i.e. a type parameter of a generic function). We cache
     // results for union and intersection types for performance reasons.
     function couldContainTypeVariables(type: Type): boolean {
+        if (type.flags & TypeFlags.Intrinsic) return false;
         const objectFlags = getObjectFlags(type);
         if (objectFlags & ObjectFlags.CouldContainTypeVariablesComputed) {
             return !!(objectFlags & ObjectFlags.CouldContainTypeVariables);