Prevent clang from optimizing away a variable.

Prevent clang from optimizing away a variable.

It looks like clang recently learned how to optimize away more stuff.
This should hopefully fix Memcheck sanity test 1.

BUG=102355
TEST=Bots on the memory.fyi waterfall go green


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=108095

[Timur Iskhodzhanov, 2011-10-31 17:01:05]

LGTM++
Clang looks too optimal for Valgrind :)

[commit-bot: I haz the power, 2011-10-31 17:03:02]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/thakis@chromium.org/8429008/1

[commit-bot: I haz the power, 2011-10-31 19:37:05]

Commit queue rejected this change because the description was changed
between the time the change entered the commit queue and the time it
was ready to commit. You can safely check the commit box again.

[commit-bot: I haz the power, 2011-10-31 19:40:40]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/thakis@chromium.org/8429008/1

[commit-bot: I haz the power, 2011-10-31 21:24:12]

Try job failure for 8429008-1 (retry) on mac_rel for step "ui_tests" (clobber
build).
It's a second try, previously, step "compile" failed.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=mac_rel&nu...

[commit-bot: I haz the power, 2011-11-01 09:21:48]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/thakis@chromium.org/8429008/1

[commit-bot: I haz the power, 2011-11-01 11:08:11]

Change committed as 108095