Add a script for driving csmith to generate large compilation inputs.
Add a script for driving csmith to generate large compilation inputs.

BUG=None
R=dschuff@chromium.org

Review URL: https://codereview.chromium.org/91043004

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@12466 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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