Update prebuilt Clang to build 3859424.

Built from version 4.0.285906.

Bug: http://b/36442361

(cherry picked from commit c3cd7434992aac53acfb5c29432b3f584fe9dd80)

Change-Id: I6dd7b428ec274a54c9d97321bf83d098fb8501f5
189 files changed