Enable clang-3.8 as primary compiler
Enable clang-3.8 as primary compiler

Change-Id: I30b7c94c5cbac23fe805026cfdfbb63aa3306c15

google/android-cuttlefish,google/android-cuttlefish,google/android-cuttlefish,google/android-cuttlefish,google/android-cuttlefish,google/android-cuttlefish,google/android-cuttlefish