Enable annotalysis on clang ART builds.

Fix clang build errors aswell as restructure locking/mutex code for correct
thread safety analysis support.
Reorder make dependencies so that host builds build first as they should
provide better compilation errors than target.
Remove host's use of -fno-omit-frame-pointer as it has no value with correct
use of CFI, which we should have.

Change-Id: I72cea8da9a3757b1a0b3acb4081feccb7c6cef90
diff --git a/runtime/arch/context.h b/runtime/arch/context.h
index 83bbb11..f7b7835 100644
--- a/runtime/arch/context.h
+++ b/runtime/arch/context.h
@@ -20,7 +20,7 @@
 #include <stddef.h>
 #include <stdint.h>
 
-#include "locks.h"
+#include "base/mutex.h"
 
 namespace art {