PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS

This pulls in the following LLVM change:

a667d44: (dbrazdil@chromium.org) Add StripTls MinSFI LLVM pass

BUG= https://code.google.com/p/chromium/issues/detail?id=397177
TEST= PNaCl toolchain trybots

Review URL: https://codereview.chromium.org/510943004

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@13669 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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