Update prebuilt Clang to r344140b.

clang 8.0.4 (based on r344140) from build 5122994.

Bug: http://b/119270185
Test: N/A
Change-Id: I398f34bb07cdbb382734559ae326bbfa45c9d241
Signed-off-by: Akhil Narang <akhilnarang.1999@gmail.com>
2508 files changed