review(XXS): 7026307: DEBUG MESSAGE: broken null klass on amd64

[Igor Veresov]

I made a copy-paste error while refactoring for 7020521, in 
stubGenerator_x86_64.cpp:
   address generate_generic_copy(const char *name,
                                 address byte_copy_entry, address 
short_copy_entry,
                                 address int_copy_entry, address 
long_copy_entry,
                                 address oop_copy_entry, address 
checkcast_copy_entry)

The order of arguments is wrong, entry_oop_arraycopy and 
entry_jlong_arraycopy should be swapped like on other architectures. 
With compressed oops this would cause stomping, among other things, 
which was caught in nighlies.

Webrev: http://cr.openjdk.java.net/~iveresov/7026307/webrev.00/

Testing: Failing nightly test.


Thanks,
igor