[Issue 21365] New: TypeInfo.swap must not allow reachable memory to be freed if interrupted for a garbage collection pass

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21365

          Issue ID: 21365
           Summary: TypeInfo.swap must not allow reachable memory to be
                    freed if interrupted for a garbage collection pass
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: druntime
          Assignee: nobody at puremagic.com
          Reporter: n8sh.secondary at hotmail.com

If the type might contain pointers perform the swap in pointer-sized chunks in
case a garbage collection pass occurs partway through the function. Directly
affected TypeInfo subclasses that were not overriding swap:

- TypeInfo_AssociativeArray
- TypeInfo_Class
- TypeInfo_Delegate
- TypeInfo_Interface
- TypeInfo_Struct

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