Add a script that can generate simple test cases for user-exposed JS builtins

Add a script that can generate simple test cases for user-exposed JS builtins

(we won't check in any such tests; they can be generated on the fly when needed)

R=mbarbella@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=23862

[Martin Barbella, 2014-09-09 15:21:14]

mbarbella@chromium.org changed reviewers:
+ mbarbella@chromium.org

[Martin Barbella, 2014-09-09 15:21:15]

LGTM with respect to the generated content. I didn't have time to review this
carefully for style/potential bugs.

For later reference, feedback was given on the initial CL in an email thread.
The biggest change was replacing literals with variables to make it easier for
the fuzzer to mutate test cases, since it is less strict with attempting to
preserve type information in this case.

[Jakob Kummerow, 2014-09-11 09:59:09]

Committed patchset #2 (id:20001) manually as 23862 (presubmit successful).