Update clang to r344140

Bug: 111759196
Test: Test various targets in AOSP and internal branches.
      For Googlers, go/clang-r344140-testing
Change-Id: I70fc5a2824de698d78c95ce2acd42eff9c5ebe15
diff --git a/cc/config/global.go b/cc/config/global.go
index 3e76373..057e08a 100644
--- a/cc/config/global.go
+++ b/cc/config/global.go
@@ -126,8 +126,8 @@
 
 	// prebuilts/clang default settings.
 	ClangDefaultBase         = "prebuilts/clang/host"
-	ClangDefaultVersion      = "clang-r339409b"
-	ClangDefaultShortVersion = "8.0.2"
+	ClangDefaultVersion      = "clang-r344140"
+	ClangDefaultShortVersion = "8.0.3"
 
 	// Directories with warnings from Android.bp files.
 	WarningAllowedProjects = []string{