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

This pulls in the following LLVM changes:

3f6504d: (mseaborn@chromium.org) PNaCl ABI: Disallow the "externally_initialized" attribute of GlobalVariables
402eecf: (mseaborn@chromium.org) PNaCl ABI: Reduce the set of allowed "align" attributes on loads/stores

BUG= https://code.google.com/p/nativeclient/issues/detail?id=3415
BUG= https://code.google.com/p/nativeclient/issues/detail?id=3445
TEST=PNaCl toolchain trybots

Review URL: https://codereview.chromium.org/17508003

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@11588 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