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

This pulls in the following LLVM changes:

3a69b22: (mseaborn@chromium.org) PNaCl wire format: Remove code for reading old SwitchInst representation
e635564: (mseaborn@chromium.org) PNaCl wire format: Remove magic number and hash from encoding of 'switch'
69aca32: (mseaborn@chromium.org) PNaCl wire format: Clean up representation of "alloca" instruction

BUG= https://code.google.com/p/nativeclient/issues/detail?id=3507
TEST=PNaCl toolchain trybots
TBR=jvoung@chromium.org

Review URL: https://codereview.chromium.org/17912002

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@11617 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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