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/jit/jit_code_cache.h b/runtime/jit/jit_code_cache.h
index 612d06b..eea2771 100644
--- a/runtime/jit/jit_code_cache.h
+++ b/runtime/jit/jit_code_cache.h
@@ -39,6 +39,7 @@
 class ArtMethod;
 class LinearAlloc;
 class InlineCache;
+class OatQuickMethodHeader;
 class ProfilingInfo;
 
 namespace jit {