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

This pulls in the following LLVM changes:

948e79b: (eliben@chromium.org) Implement sandboxing of NEON store instructions
cf7e8fe: (jfb@chromium.org) Rename NotNaCl to IsNotNacl, for consistency with other similarly-named predicates.
dd5234b: (sehr@chromium.org) Use __aeabi_read_tp for non-nacl
f4099a3: (mseaborn@chromium.org) Fix nacl.read.tp() intrinsic to not generate "addl %gs:0, %REG"

BUG=none
TEST=PNaCl toolchain trybots

Review URL: https://codereview.chromium.org/11361278

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@10276 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client