Move implementations from class_root.h to -inl.h .

Make it possible to include the definition of enum ClassRoot
without pulling in a lot of other headers.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Test: aosp_taimen-userdebug boots.
Change-Id: Ic90fdd70bfe0c5428a5c9a0d7901ea7e15b03488
diff --git a/test/1985-structural-redefine-stack-scope/stack_scope.cc b/test/1985-structural-redefine-stack-scope/stack_scope.cc
index 5c5215b..02d04dd 100644
--- a/test/1985-structural-redefine-stack-scope/stack_scope.cc
+++ b/test/1985-structural-redefine-stack-scope/stack_scope.cc
@@ -21,7 +21,7 @@
 #include <vector>
 
 #include "class_linker.h"
-#include "class_root.h"
+#include "class_root-inl.h"
 #include "jni.h"
 #include "jni/jni_internal.h"
 #include "mirror/class.h"