Avoid -O3 in nacl as it does not play well with -W.

Avoid -O3 in nacl as it does not play well with -W.

Also cleans up some uninitialized data I saw while investigating
the problem.

R=jkummerow@chromium.org, machenbach@chromium.org

Committed: http://code.google.com/p/v8/source/detail?r=16235

[Michael Achenbach, 2013-08-14 15:23:59]

lgtm with comments:

It fixes the issue. Even though, I am not happy that toolchain.gypi is full of
exceptions...

@Jakob: Second pair of eyes?

[kmixter2, 2013-08-14 22:36:54]

I agree.  I am sorry for adding more exceptions.

[Jakob Kummerow, 2013-08-19 12:48:37]

LGTM.

Same feelings here -- toolchain.gypi is getting messy, but when it's needed to
fix the build, what choice do we have?

I'm looking forward to being able to remove this again :-)

[kmixter2, 2013-08-19 23:22:54]

Thanks.  I've checked the commit button - though I doubt there's a commit queue
for v8 (given it doesn't have a trybot).  I can't gcl commit a change though
since the tree state is throttled this week.  This seems like a bugfix.  How do
I get permission to commit?

[Jakob Kummerow, 2013-08-20 08:05:35]

Indeed, there's no CQ for V8. I'll land this for you.

[Jakob Kummerow, 2013-08-20 08:12:27]

Committed patchset #1 manually as r16235.