Crash in checkTypeReferenceNode when JSDoc tries to instantiate non-generic

[RyanCavanaugh]

Found when trying to reverse engineer a repro for #17377

/**
 * @param {<T>(m: Boolean<T>) => string} somebody
 */
function sayHello(somebody) {
    alert('Hello ' + somebody);
}

C:\github\TypeScript\built\local\tsc.js:69844
                throw e;
                ^

TypeError: Cannot read property 'flags' of undefined
    at checkTypeReferenceNode (C:\github\TypeScript\built\local\tsc.js:39426:52)
    at checkSourceElement (C:\github\TypeScript\built\local\tsc.js:42606:28)
    at checkVariableLikeDeclaration (C:\github\TypeScript\built\local\tsc.js:40712:13)
    at checkParameter (C:\github\TypeScript\built\local\tsc.js:38879:13)
    at Object.forEach (C:\github\TypeScript\built\local\tsc.js:1463:30)
    at checkSignatureDeclaration (C:\github\TypeScript\built\local\tsc.js:39021:16)
    at checkSourceElement (C:\github\TypeScript\built\local\tsc.js:42594:28)
    at checkSourceElement (C:\github\TypeScript\built\local\tsc.js:42640:28)
    at checkSourceElement (C:\github\TypeScript\built\local\tsc.js:42626:28)
    at checkJSDocComment (C:\github\TypeScript\built\local\tsc.js:40221:21)