msvcrt heap: fix _aligned_offset_realloc (move correct block of memory); add a comment to explain why. [1/2]

[Lionel Debroux]

A recent memory leak fix in the msvcrt heap tests, made by Dan Kegel, uncovered a bug in
_aligned_offset_realloc: the data contained in the previously allocated block is copied at a wrong
offset in the newly allocated block, often overwriting the arena magic and other heap structures.
As a result, the test crashes.


Here's a patch that fixes _aligned_offset_realloc, and adds an explanation of the data layout in
memory.
See also: http://bugs.winehq.org/show_bug.cgi?id=10521


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