jest libdef [nfc]: Move some definitions up a bit

The current 26 libdef upstream chooses this location for
setSystemTime, and we're about to re-sync with that. (Current
upstream doesn't have getRealSystemTime, but it might as well move
too.)

Author: chrisbobbe

flow-typed/jest_v26.x.x.js

@@ -806,6 +806,26 @@ type JestObjectType = {
    * Returns the number of fake timers still left to run.
    */
   getTimerCount(): number,
+  /**
+   * When mocking time, `Date.now()` will also be mocked. If you for
+   * some reason need access to the real current time, you can invoke
+   * this function.
+   *
+   * > Note: This function is only available when using modern fake
+   * > timers implementation
+   */
+  getRealSystemTime(): number,
+  /**
+   *  Set the current system time used by fake timers. Simulates a
+   *  user changing the system clock while your program is running. It
+   *  affects the current time but it does not in itself cause e.g.
+   *  timers to fire; they will fire exactly as they would have done
+   *  without the call to `jest.setSystemTime()`.
+   *
+   *  > Note: This function is only available when using modern fake
+   *  > timers implementation
+   */
+  setSystemTime(now?: number | Date): void,
   /**
    * The same as `mock` but not moved to the top of the expectation by
    * babel-jest.
@@ -921,26 +941,6 @@ type JestObjectType = {
    * Instructs Jest to use the real versions of the standard timer functions.
    */
   useRealTimers(): JestObjectType,
-  /**
-   * When mocking time, `Date.now()` will also be mocked. If you for
-   * some reason need access to the real current time, you can invoke
-   * this function.
-   *
-   * > Note: This function is only available when using modern fake
-   * > timers implementation
-   */
-  getRealSystemTime(): number,
-  /**
-   *  Set the current system time used by fake timers. Simulates a
-   *  user changing the system clock while your program is running. It
-   *  affects the current time but it does not in itself cause e.g.
-   *  timers to fire; they will fire exactly as they would have done
-   *  without the call to `jest.setSystemTime()`.
-   *
-   *  > Note: This function is only available when using modern fake
-   *  > timers implementation
-   */
-  setSystemTime(now?: number | Date): void,
   /**
    * Creates a mock function similar to jest.fn but also tracks calls to
    * object[methodName].