New test variant for --cache=parse

New test variant for --cache=parse

This CL updates run-tests.py to add a variant which exercises
kProduceCodeCache and kConsumeParserCache (which is how Blink typically
uses V8).

Also adds a TryCatch to CompileForCachedData() in d8 to avoid printing
SyntaxErrors twice (for tests like message/isvar which expect d8 to print a
syntax error).

Note that this increases the time to run the default tests by about 20%.

BUG=v8:3651
LOG=

[Ian Cullinan, 2014-10-24 21:57:49]

cullinan@amazon.com changed reviewers:
+ machenbach@chromium.org

[Ian Cullinan, 2014-10-24 21:57:50]

Hi Michael,

PTAL at this patch for improving test coverage of CachedData, necessitated by
https://codereview.chromium.org/641283003/

Thanks,
Ian C

[Jakob Kummerow, 2014-10-27 10:16:43]

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

[Jakob Kummerow, 2014-10-27 10:16:43]

I'm opposed to adding more variants. The test suite is too slow as it is.

I don't know the overall situation here -- maybe the flag should just be turned
on by default? Or always be specified by the test runner?

[Ian Cullinan, 2014-10-27 22:07:15]

On 2014/10/27 10:16:43, Jakob wrote:
> I'm opposed to adding more variants. The test suite is too slow as it is.
> 
> I don't know the overall situation here -- maybe the flag should just be
turned
> on by default? Or always be specified by the test runner?

Good point. Completely understand.

I tried making --cache=parse the default in run-tests.py and it also increased
the test time by about 20%. Doing this on a bot (as suggested by yangguo) makes
sense. Looking at how the new code serializer bot works, it would be messy to
make it run both. What would you think about adding another bot like the code
serializer one, except using --cache=parse instead of --cache=code? I would be
happy to send an infra patch for that.

Since https://codereview.chromium.org/641283003/ is my primary motivation for
getting this coverage, I'm happy to just run the tests with --cache=parse
locally if we can't find a suitable approach.

Cheers,
Ian C