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

This pulls in the following LLVM changes:

f72e0b5: (mseaborn@chromium.org) PNaCl: Add a pass to expand out Clang's use of registers of struct type
381b0fb: (mseaborn@chromium.org) PNaCl ABI checker: Disallow llvm.lifetime.start/end intrinsics

BUG= https://code.google.com/p/nativeclient/issues/detail?id=3343
BUG= https://code.google.com/p/nativeclient/issues/detail?id=3443
TEST=PNaCl toolchain trybots

Review URL: https://codereview.chromium.org/15894016

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@11431 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client