This is a reland of f720d024
Original change's description:
> [mjsunit] Improve mjsunit stracktrace readability
> 
> Format the function name and file-position into proper columns to easily spot
> where the test code ends and the mjsunit framework code starts.
> 
> BEFORE:
> Stack: Error
>     at new MjsUnitAssertionError (test/mjsunit/mjsunit.js:36:18)
>     at failWithMessage (test/mjsunit/mjsunit.js:310:11)
>     at fail (test/mjsunit/mjsunit.js:327:12)
>     at assertEquals (test/mjsunit/mjsunit.js:398:7)
>     at closure (test/mjsunit/regress/regress-4121.js:20:7)
>     at literals_sharing_test (test/mjsunit/regress/regress-4121.js:27:3)
>     at test (test/mjsunit/regress/regress-4121.js:37:5)
>     at eval (eval at <anonymous> (test/mjsunit/regress/regress-4121.js:49:6), <anonymous>:1:1)
>     at test/mjsunit/regress/regress-4121.js:49:6
>     at Array.forEach.call (test/mjsunit/regress/regress-4121.js:50:7)
>     throw new MjsUnitAssertionError(message);
> 
> AFTER:
> Stack: MjsUnitAssertionError
>     at assertEquals          test/mjsunit/mjsunit.js 398:7
>     at closure               test/mjsunit/regress/regress-4121.js 20:7
>     at literals_sharing_test test/mjsunit/regress/regress-4121.js 27:3
>     at test                  test/mjsunit/regress/regress-4121.js 37:5
>     at eval                  eval at <anonymous> (test/mjsunit/regress/regress-4121.js:49:6)
>     at                       test/mjsunit/regress/regress-4121.js 49:6
>     at Array.forEach.call    test/mjsunit/regress/regress-4121.js 50:7
>     throw new MjsUnitAssertionError(message);
> 
> 
> Change-Id: Iad3460a648e26effb43c00426ab043743ee6a138
> Reviewed-on: https://chromium-review.googlesource.com/563627
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Commit-Queue: Camillo Bruni <cbruni@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#46589}

Change-Id: I44bf07f7be4114369315605542cafd17345b4397
Reviewed-on: https://chromium-review.googlesource.com/567063Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46602}