Switch clang to r353983

Bug: 126457671
Bug: 123638879
Bug: 128878287
Test: go/clang-r353983-testing
Change-Id: I7f16e68f0f521ff55587084932d175b704e452c9
diff --git a/cc/config/global.go b/cc/config/global.go
index 689b315..e3fab0c 100644
--- a/cc/config/global.go
+++ b/cc/config/global.go
@@ -120,8 +120,8 @@
 
 	// prebuilts/clang default settings.
 	ClangDefaultBase         = "prebuilts/clang/host"
-	ClangDefaultVersion      = "clang-r349610"
-	ClangDefaultShortVersion = "8.0.8"
+	ClangDefaultVersion      = "clang-r353983"
+	ClangDefaultShortVersion = "9.0.1"
 
 	// Directories with warnings from Android.bp files.
 	WarningAllowedProjects = []string{