Switch to clang-r346389b.

Bug: 120551946
Test: make checkbuild, boot, go/clang-r346389b-testing
Change-Id: I71e28ee97cb02b6be71847b53fbb05007c936e34
diff --git a/cc/config/global.go b/cc/config/global.go
index 92969b0..13ad27c 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-r346389"
-	ClangDefaultShortVersion = "8.0.5"
+	ClangDefaultVersion      = "clang-r346389b"
+	ClangDefaultShortVersion = "8.0.6"
 
 	// Directories with warnings from Android.bp files.
 	WarningAllowedProjects = []string{