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

This pulls in the following changes:

ea660c1 Remove dead instructions from the PNaCl bitcode reader/writer
63af07f Remove constant expressions and constant inline assembly from the
6877ef9 Clean some PNaCl-specific tests.
83e9ba3 More pnacl-llc cleanups.
4499aac Hide the x86-64 sandbox base address.

Review CL: https://codereview.chromium.org/20124002
Review CL: https://codereview.chromium.org/20172002
Review CL: https://codereview.chromium.org/19606003
Review CL: https://codereview.chromium.org/20186002
Review CL: https://codereview.chromium.org/19505003

BUG= https://code.google.com/p/nativeclient/issues/detail?id=3590
BUG= https://code.google.com/p/nativeclient/issues/detail?id=3590
BUG= https://code.google.com/p/nativeclient/issues/detail?id=3588
BUG= https://code.google.com/p/nativeclient/issues/detail?id=1235
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/20371002

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@11857 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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