[Issue 18767] New: __xtoHash memberwise hashing shouldn't just sum the member hashes

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18767

          Issue ID: 18767
           Summary: __xtoHash memberwise hashing shouldn't just sum the
                    member hashes
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: n8sh.secondary at hotmail.com

Currently:
```
    const(char)* code =
        "size_t h = 0;" ~
        "foreach (i, T; typeof(p.tupleof))" ~
        "    h += typeid(T).getHash(cast(const void*)&p.tupleof[i]);" ~
        "return h;";
```

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