Reduce header files including header files.

Main focus is getting heap.h out of runtime.h.

Change-Id: I8d13dce8512816db2820a27b24f5866cc871a04b
diff --git a/runtime/verifier/instruction_flags.h b/runtime/verifier/instruction_flags.h
index e50ba13..f8abca0 100644
--- a/runtime/verifier/instruction_flags.h
+++ b/runtime/verifier/instruction_flags.h
@@ -17,11 +17,11 @@
 #ifndef ART_RUNTIME_VERIFIER_INSTRUCTION_FLAGS_H_
 #define ART_RUNTIME_VERIFIER_INSTRUCTION_FLAGS_H_
 
-#include "base/logging.h"
-
 #include <stdint.h>
 #include <string>
 
+#include "base/logging.h"
+
 namespace art {
 namespace verifier {