Fix issue with math_precision.js

[arv]

It was missing vars which was causing issues with our test harness
since we run all the files in strict mode.

[arv]

@bterlson @jugglinmike PTAL

[arv]

More background: The V8 test harness runs d8 with --use-strict command line flag and therefore this file fails to parse.

[jugglinmike]

This looks good to me. I don't understand how this ever worked in strict mode.

Also, @arv, doesn't running with d8 --use_strict invalidate all the tests that specify noStrict?

[arv]

@jugglinmike noStrict and onlyStrict are taken into account.

https://github.com/v8/v8-git-mirror/blob/master/test/test262-es6/testcfg.py#L84

[jugglinmike]

Oooh. I thought you meant you were running with --use_strict unconditionally, as in:

test262.py --command "d8 --use_strict"

[arv]

We do not use the test runner provided by tc39/test262