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/class_linker.cc b/runtime/class_linker.cc
index 6573bc0..b6f417d 100644
--- a/runtime/class_linker.cc
+++ b/runtime/class_linker.cc
@@ -57,7 +57,7 @@
 #include "cha.h"
 #include "class_linker-inl.h"
 #include "class_loader_utils.h"
-#include "class_root.h"
+#include "class_root-inl.h"
 #include "class_table-inl.h"
 #include "compiler_callbacks.h"
 #include "debug_print.h"