ART: Introduce thread-current-inl.h

Factor out Thread::Current() code into its own -inl file to remove
transitive includes.

This requires at the same time correcting mutex.h, i.e., moving
some functions into mutex-inl.h.

Test: m test-art-host
Change-Id: I88f888b604e0897368d9b483edce6ce4332dd9c9
diff --git a/runtime/art_method-inl.h b/runtime/art_method-inl.h
index 9d0bfde..8567c00 100644
--- a/runtime/art_method-inl.h
+++ b/runtime/art_method-inl.h
@@ -38,7 +38,7 @@
 #include "quick/quick_method_frame_info.h"
 #include "runtime-inl.h"
 #include "scoped_thread_state_change-inl.h"
-#include "thread-inl.h"
+#include "thread-current-inl.h"
 #include "utils.h"
 
 namespace art {