[arm64_32] fix pointer size in CallInfo (mono/mono#16970)

[arm64_32] fix pointer size in CallInfo (mono/mono#16970)

Note that in the output below `a`, `b`, etc. are NSObjects, so they are really passed as pointer.

Before:
```
* thread mono/mono#1, name = 'tid_303', queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
    frame mono/mono#0: 0x04f301d4 aWatchOSExtension`::xamarin_localized_string_format_9(format="hello%@%@%@%@%@%@%@%@%@", a=0, b=1, c=2, d=3, e=4, f=5, g=6, h=7, i=0x00000000) at nsstring-localization.m:81:9
   78   void *
   79   xamarin_localized_string_format_9 (NSString *format, id a, id b, id c, id d, id e, id f, id g, id h, id i)
   80   {
-> 81           return [NSString localizedStringWithFormat: format, a, b, c, d, e, f, g, h, i];
   82   }
   83
   84   }
(lldb) mbt 4
* thread mono/mono#1
  * frame mono/mono#0: 0x04f301d4 aWatchOSExtension`::xamarin_localized_string_format_9(format="hello%@%@%@%@%@%@%@%@%@", a=0, b=1, c=2, d=3, e=4, f=5, g=6, h=7, i=0x00000000) at nsstring-localization.m:81:9
    frame mono/mono#1: 0x04d9984c aWatchOSExtension`interp_to_native_trampoline + 156
    frame mono/mono#2: 0x04f41d5c aWatchOSExtension`ves_pinvoke_method(frame=0x05167af8, sig=0x1518afd0, addr=(aWatchOSExtension`::xamarin_localized_string_format_9(NSString *, id, id, id, id, id, id, id, id, id) at nsstring-localization.m:80), string_ctor=0, context=0x14550960, save_last_error=0) at interp.c:1411:2 [opt]
    NSString::xamarin_localized_string_format_9 @ 68 "calli.nat" || frame mono/mono#3: 0x04f3bfa4 aWatchOSExtension`interp_exec_method_full(frame=0x05167d38, context=<unavailable>, clause_args=0x00000000, error=0x05168540) at interp.c:3290:5 [opt]
```

After:
```
* thread mono/mono#1, name = 'tid_303', queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
    frame mono/mono#0: 0x04c2c1e0 aWatchOSExtension`::xamarin_localized_string_format_9(format="hello%@%@%@%@%@%@%@%@%@", a=0, b=1, c=2, d=3, e=4, f=5, g=6, h=7, i=8) at nsstring-localization.m:81:9
   78   void *
   79   xamarin_localized_string_format_9 (NSString *format, id a, id b, id c, id d, id e, id f, id g, id h, id i)
   80   {
-> 81           return [NSString localizedStringWithFormat: format, a, b, c, d, e, f, g, h, i];
   82   }
   83
   84   }
```

Commit migrated from https://github.com/mono/mono/commit/0f181a9dc4bc5d08e7876a726237c3d10e671b16