Revert of PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS (patchset #1 id:1 of https://codereview.chromium.org/1008693005/)
Revert of PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS (patchset #1 id:1 of https://codereview.chromium.org/1008693005/)

Reason for revert:
This causes a bunch of failures on the PNaCl toolchain waterfall, which seem related to reading bad data from the stack. Reverting.

Original issue's description:
> PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
>
> This pulls in the following LLVM changes:
>
> 899d5ab: (stichnot@chromium.org) Allow the LLVM cmake build to use ccache.
> c5f8056: (jfb@chromium.org) ExpandVarArgs: don't pack the vararg struct
>
> BUG= https://code.google.com/p/nativeclient/issues/detail?id=4102
> TEST= PNaCl toolchain trybots
> TBR= dschuff@chromium.org
>
> Committed: https://chromium.googlesource.com/native_client/src/native_client/+/84b4c32e4b53a143a8599d26df25a4d5d996c825

TBR=dschuff@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4102

Review URL: https://codereview.chromium.org/1002423002

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