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/runtime/native/java_lang_reflect_Executable.cc b/runtime/native/java_lang_reflect_Executable.cc
index 2ce56b5..fef16b9 100644
--- a/runtime/native/java_lang_reflect_Executable.cc
+++ b/runtime/native/java_lang_reflect_Executable.cc
@@ -20,7 +20,7 @@
 #include "nativehelper/jni_macros.h"
 
 #include "art_method-inl.h"
-#include "class_root.h"
+#include "class_root-inl.h"
 #include "dex/dex_file_annotations.h"
 #include "handle.h"
 #include "jni/jni_internal.h"