Merge "Switch to clang-r346389."

am: 89dbee61ff

Change-Id: I18befe8152bb455cee18852a5b494256c0c175be

cc/config/clang.go

@@ -91,7 +91,9 @@ var ClangUnknownLldflags = sorted([]string{
 	"-Wl,-m,aarch64_elf64_le_vec",
 })
 
-var ClangLibToolingUnknownCflags []string = nil
+var ClangLibToolingUnknownCflags = sorted([]string{
+	"-fno-sanitize=implicit-integer-sign-change",
+})
 
 func init() {
 	pctx.StaticVariable("ClangExtraCflags", strings.Join([]string{