Update prebuilt Clang to r353983c.

clang 9.0.3 (based on r353983c) from build 5484270.

Bug: http://b/129712936
Test: N/A
Change-Id: I9bca1ca3906fb7eefbcfb834681a8c089eefc9e7
Signed-off-by: Henrique Pereira <pereirah2001@gmail.com>
2695 files changed