ART: Clean up includes.

Reduce dependencies to improve incremental build times.
Break up circular dependency involving class_linker-inl.h.

Change-Id: I4be742c5c2b5cd9855beea86630fd68aab76b0db
diff --git a/runtime/runtime.cc b/runtime/runtime.cc
index 66d38ce..543b9dc 100644
--- a/runtime/runtime.cc
+++ b/runtime/runtime.cc
@@ -54,7 +54,7 @@
 #include "base/arena_allocator.h"
 #include "base/dumpable.h"
 #include "base/unix_file/fd_file.h"
-#include "class_linker.h"
+#include "class_linker-inl.h"
 #include "compiler_callbacks.h"
 #include "debugger.h"
 #include "elf_file.h"