Switch to clang-r407598 (12.0.1).

Also suppress a clang-tidy warning and a ubsan check to pass compilation.

Bug: 171348143
Test: build.
Change-Id: Ie5162c15df172cefd7cff9776e54531fd620bc23
diff --git a/cc/config/global.go b/cc/config/global.go
index e5cb7ee..fa8e0fb 100644
--- a/cc/config/global.go
+++ b/cc/config/global.go
@@ -135,8 +135,8 @@
 
 	// prebuilts/clang default settings.
 	ClangDefaultBase         = "prebuilts/clang/host"
-	ClangDefaultVersion      = "clang-r399163b"
-	ClangDefaultShortVersion = "11.0.5"
+	ClangDefaultVersion      = "clang-r407598"
+	ClangDefaultShortVersion = "12.0.1"
 
 	// Directories with warnings from Android.bp files.
 	WarningAllowedProjects = []string{