Reduce egyptian_cotton_test thread count for Mac ASan
Reduce egyptian_cotton_test thread count for Mac ASan

The "Egyptian cotton" test falls over on Mac x86-32 under ASan because
the available address space (as reduced by ASan overhead) runs out.
Set a new thread limit for this case.

BUG= none
TEST= hand-tested on mac asan bot
R=bradnelson@google.com

Review URL: https://codereview.chromium.org/22793010

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@12043 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client