ART: Clean up thread.h and thread_list.h

Remove dependency on stack.h and gc_root.h. Remove unused object
callbacks include. Factor out ManagedStack into its own set of files.
Fix up users of transitive includes.

Test: m test-art-host
Change-Id: I01286c43d8c7710948c161b1348faabb05922e59
diff --git a/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc b/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
index 2b349e3..90231e2 100644
--- a/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
+++ b/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
@@ -18,6 +18,7 @@
 #include "base/enums.h"
 #include "callee_save_frame.h"
 #include "common_throws.h"
+#include "debugger.h"
 #include "dex_file-inl.h"
 #include "dex_instruction-inl.h"
 #include "entrypoints/entrypoint_utils-inl.h"
@@ -40,7 +41,7 @@
 #include "runtime.h"
 #include "scoped_thread_state_change-inl.h"
 #include "stack.h"
-#include "debugger.h"
+#include "thread-inl.h"
 #include "well_known_classes.h"
 
 namespace art {