NDK Release 17b
Update prebuilt Clang to build 4691093.

Built from version 6.0.2
based on r316199.

Bug: http://b/68397894
Test: N/A
Change-Id: I52271430544132139169d939aac8820a7e9956a8
Merged-In: I52271430544132139169d939aac8820a7e9956a8
(cherry picked from commit 07a6ca6ba9cf227ee0722b0bcc8e4fc93d7f1557)
(cherry picked from commit aeacf68838a558eef1d64e3d155ba37e9ca67bca)
2120 files changed