Make Size Returned from HeapSize Always Match The Requested Size (Try 2)

[Robert Shearman]

Hi,

Change since last patch: steal bits from magic field instead of 
increasing the size of the arena by 8 bytes.

An application I have seen depends on HeapSize returning the size that 
was passed into HeapAllocate or HeapReAllocate otherwise it will 
overflow the memory given to it.

Changelog:
- Make the value returned from HeapSize always match the requested size 
passed into HeapAllocate/HeapReAllocate.
- Add a test for this behaviour.

-- 
Rob Shearman

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