Update PNaCl DEPS.
Update PNaCl DEPS.

Pull in:
 - LLVM: Add the new @llvm.nacl.atomic.fence.all intrinsic
 - Clang: Treat __sync_synchronize and asm(:::memory) as stronger fences.

R=jvoung@chromium.org
BUG= https://code.google.com/p/nativeclient/issues/detail?id=3475
TEST= ninja check-all

Review URL: https://codereview.chromium.org/22635002

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@11947 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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