Update TOOL_REVISIONS for PNaCl r12851->r12875
Update TOOL_REVISIONS for PNaCl r12851->r12875

Pull the following PNaCl changes into NaCl:
  r12856: (jvoung@google.com) Remove bots scripts for the old PNaCl merge bot.
  r12857: (jvoung@google.com) Move varargs tests w/ aggregates out of known failures, since they pass.
  r12859: (jfb@chromium.org) PNaCl: update deps_update.py for the new build
  r12861: (noelallen@google.com) BIONIC Fix build order and circular deps to turn experimental toolchain bot green.
  r12874: (jvoung@google.com) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
    | 2a2ca21: (jvoung@chromium.org) Link LLVM bitcode reader into the sandboxed PNaCl for debug support.
  r12875: (kschimpf@google.com) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
    | ea40bed: (kschimpf@google.com) Speed up abbreviation index selection in pnacl-bccompress.

R=mseaborn@chromium.org, bradnelson@google.com, dschuff@chromium.org, jfb@chromium.org, jvoung@chromium.org, jvoung@google.com, kschimpf@google.com, mcgrathr@chromium.org, noelallen@google.com
TEST=git try
NOTRY=true
(Please LGTM this change and tick the "commit" box)

Review URL: https://codereview.chromium.org/197843003

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@12879 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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