Switch to Clang 3.4 prebuilts.
Switch to Clang 3.4 prebuilts.

Change-Id: Ic8b0a7db4bb8ea96013e6b8c2f1fcdb80b6a7b03

xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build