Update prebuilt Clang to r383902b.

clang 11.0.2 (based on r383902b) from build 6573524.

Bug: http://b/149417653
Test: N/A
Change-Id: I80a033af4ca3eccb7b7e93c22e6411e75dd7b30c
(cherry picked from commit d53798cd9b93067abe95db6f82a0fc28df0a5e3a)
4825 files changed