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`any` appears to shortcircut structural type checking
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<!-- Please try to reproduce the issue with `typescript@next`. It may have already been fixed. -->
**TypeScript Version:** 3.5.0-dev.20190507
<!-- Search terms you tried before logging this (so others can find this issue more easily) -->
**Search Terms:**
any, unsound, extends, never
**Code**
```ts
// I detect if F is `any` by checking if F extends `never`.
// (F extends never ? true : false) produces `true|false` for `F = any`
// and `false` or `never` for everything else.
type Decider<F> = {
prop: (F extends never ? true : false) extends false ? "isNotAny" : "isAny";
};
let foo!: Decider<string>;
let bar: Decider<any> = foo;
let fooProp: "isNotAny" = foo.prop;
let barProp: "isAny" = bar.prop;
```
**Expected behavior:**
Either `bar.prop` should have the type `"isAny"|"isNotAny"` or `foo` should not be assignable to `bar`.
**Actual behavior:**
`foo` is assignable to `bar` and `bar.prop` has the type `"isAny"` which is incompatible with `foo.prop`'s `"isNotAny"`.
**Playground Link:** [link](https://www.typescriptlang.org/play/#src=%2F%2F%20I%20detect%20if%20F%20is%20%60any%60%20by%20checking%20if%20F%20extends%20%60never%60.%0D%0A%2F%2F%20(F%20extends%20never%20%3F%20true%20%3A%20false)%20produces%20%60true%7Cfalse%60%20for%20%60F%20%3D%20any%60%0D%0A%2F%2F%20and%20%60false%60%20or%20%60never%60%20for%20everything%20else.%0D%0Atype%20Decider%3CF%3E%20%3D%20%7B%0D%0A%09prop%3A%20(F%20extends%20never%20%3F%20true%20%3A%20false)%20extends%20false%20%3F%2…
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