Switch to clang-r383902 (11.0.1).

Also suppress some warnings/flags globally to pass compilation.

Bug: 149839606
Test: build aosp_arm64-userdebug.
Change-Id: I0ed740e51b6b39c58842a58eabcf3cdf404e73fa
diff --git a/cc/tidy.go b/cc/tidy.go
index cfb5b68..364e56c 100644
--- a/cc/tidy.go
+++ b/cc/tidy.go
@@ -121,6 +121,12 @@
 	// many local projects enable cert-* checks, which
 	// trigger bugprone-reserved-identifier.
 	tidyChecks = tidyChecks + ",-bugprone-reserved-identifier*,-cert-dcl51-cpp,-cert-dcl37-c"
+	// http://b/153757728
+	tidyChecks = tidyChecks + ",-readability-qualified-auto"
+	// http://b/155034563
+	tidyChecks = tidyChecks + ",-bugprone-signed-char-misuse"
+	// http://b/155034972
+	tidyChecks = tidyChecks + ",-bugprone-branch-clone"
 	flags.TidyFlags = append(flags.TidyFlags, tidyChecks)
 
 	if len(tidy.Properties.Tidy_checks_as_errors) > 0 {