Fix reinterpret_cast for classes with multiple inheritance

Currently a reinterpret_cast may change the pointer value if
multiple inheritance is involved:
```
(gdb) p r
$1 = (Right *) 0x22f75c
(gdb) p reinterpret_cast<LeftRight*>(r)
$2 = (LeftRight *) 0x22f758
```

It's because value_cast is called in this case, which automatically
does up- and downcasting.

Fixed by simply using the target pointer type in a copy of the
original value:
```
(gdb) p r
$1 = (Right *) 0x3bf87c
(gdb) p reinterpret_cast<LeftRight*>(r)
$2 = (LeftRight *) 0x3bf87c
```

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=18861


Approved-By: Tom Tromey <tom@tromey.com>