ntdll: implement FLG_HEAP_ENABLE_TAIL_CHECK

[Dan Kegel]

On Wed, Nov 18, 2009 at 12:47 PM, Eric Pouech <eric.pouech at orange.fr> wrote:
> interesting stuff
> however, you don't handle correctly HeapReAlloc(..., ZERO_MEMORY,...) calls
> when the already allocated block grows in place

Thanks for catching that.
I decided to start over and push the tail fill down into the heap
routines rather than try to put it in a wrapper; the extra
abstraction wasn't helping.
Here's a second try, this time only for large arenas, but
with valgrind integration working.  (It also has a workaround for
a strange valgrind problem that leaves an empty variable in
the environment that confuses wine.)

This time around, the only test that fails with WINE_GLOBAL_FLAG=0x10
is comctl32/dpa.c, and I could well imagine that might have a real problem
lurking.

Now to tackle the small arena case...
- Dan
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