Update pnacl llvm revision.
Update pnacl llvm revision.

c5b7afc Add NaClBitReader library dependencies to pnacl-freeze.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=3626

Review CL: https://codereview.chromium.org/23072004

R=jvoung@google.com

Review URL: https://codereview.chromium.org/23098002

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@11998 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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