Make PNaCl bitcode files have a different format from LLVM bitcode files.
Make PNaCl bitcode files have a different format from LLVM bitcode files.

Roll pnacl llvm rev to: 37bdd9174a1cba17b369c8c1f561e70c458e0c13

Review URL: https://codereview.chromium.org/15907008

R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/16295028

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@11490 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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