ART: Small class-inl.h cleanup

Remove unnecessary class_linker-inl.h include, and fix up all
transitives (mainly gc_root-inl.h). Also clean up reference.h.

Test: m test-art-host
Change-Id: I47bd6edcfe4a23821e37a6e6fa8cca91d0d2d226
diff --git a/compiler/optimizing/intrinsics_mips.cc b/compiler/optimizing/intrinsics_mips.cc
index 4731da1..ea3e9e5 100644
--- a/compiler/optimizing/intrinsics_mips.cc
+++ b/compiler/optimizing/intrinsics_mips.cc
@@ -23,6 +23,7 @@
 #include "intrinsics.h"
 #include "mirror/array-inl.h"
 #include "mirror/string.h"
+#include "scoped_thread_state_change-inl.h"
 #include "thread.h"
 #include "utils/mips/assembler_mips.h"
 #include "utils/mips/constants_mips.h"
diff --git a/compiler/optimizing/intrinsics_mips64.cc b/compiler/optimizing/intrinsics_mips64.cc
index 00afbcd..2ecb1a3 100644
--- a/compiler/optimizing/intrinsics_mips64.cc
+++ b/compiler/optimizing/intrinsics_mips64.cc
@@ -23,6 +23,7 @@
 #include "intrinsics.h"
 #include "mirror/array-inl.h"
 #include "mirror/string.h"
+#include "scoped_thread_state_change-inl.h"
 #include "thread.h"
 #include "utils/mips64/assembler_mips64.h"
 #include "utils/mips64/constants_mips64.h"