Roll Clang 231191:231690

This includes fixes for ASan/MSan/UBSan configurations.

BUG=464621

Review URL: https://codereview.chromium.org/993833002

Cr-Commit-Position: refs/heads/master@{#319978}

tools/clang/scripts/update.sh

@@ -8,10 +8,10 @@
 # Do NOT CHANGE this if you don't know what you're doing -- see
 # https://code.google.com/p/chromium/wiki/UpdatingClang
 # Reverting problematic clang rolls is safe, though.
-CLANG_REVISION=231191
+CLANG_REVISION=231690
 
 # This is incremented when pushing a new build of Clang at the same revision.
-CLANG_SUB_REVISION=2
+CLANG_SUB_REVISION=1
 
 PACKAGE_VERSION="${CLANG_REVISION}-${CLANG_SUB_REVISION}"