build: TypeScript 3.6 compatibility. (#32908)

This PR updates Angular to compile with TypeScript 3.6 while retaining
compatibility with TS3.5. We achieve this by inserting several `as any`
casts for compatiblity around `ts.CompilerHost` APIs.

PR Close #32908

packages/zone.js/test/common/Promise.spec.ts

@@ -99,7 +99,7 @@ describe(
 
       xit('should ensure that Promise this is instanceof Promise', () => {
         expect(() => {
-          Promise.call({}, () => null);
+          Promise.call({} as any, () => null);
         }).toThrowError('Must be an instanceof Promise.');
       });