[GR-64051] Debuginfotest fails due to updated debug info for the object header.

[graalvmbot]

The debuginfotest fails with:

(gdb) print /x *args
Checker print String[] args: match 4 failed at line 4       reserved = 0x0

Checker print String[] args {
  re.compile('.* = {')
  re.compile('[ \t]+<java.lang.Object> = {')
  re.compile('[ \t]+<_objhdr> = {')
  re.compile('[ \t]+hub = 0x[0-9a-f]+')
  re.compile('[ \t]+}, <No data fields>}, ')
  re.compile('[ \t]+members of java\\.lang\\.String\\[\\]:')
  re.compile('[ \t]+len = 0x0,')
  re.compile('[ \t]+data = 0x[0-9a-f]+')
  re.compile('}')
}

$4 = {
  <java.lang.Object> = {
    <_objhdr> = {
      hub = 0xb9faa80,
      reserved = 0x0
    }, <No data fields>}, 
  members of java.lang.String[]:
  len = 0x0,
  data = 0x7ffc511000b4
}

This is caused by a change in the object header.
The object header may contain a reserved field, if the hub field is not located at offset 0.