8133984: print_compressed_class_space() is only defined in 64-bit VM

Summary: define method's empty body in 32-bit VM.
Reviewed-by: coleenp

src/share/vm/memory/metaspace.hpp

@@ -259,7 +259,7 @@ class Metaspace : public CHeapObj<mtClass> {
   // Debugging support
   void verify();
 
-  static void print_compressed_class_space(outputStream* st, const char* requested_addr = 0);
+  static void print_compressed_class_space(outputStream* st, const char* requested_addr = 0) NOT_LP64({});
 
   class AllocRecordClosure :  public StackObj {
   public: