[2/3] ntdll: fill unused tails of heap blocks if HEAP_FREE_CHECKING_ENABLED (take 3)

[Dan Kegel]

This is just the tail-filling part of my last submission.
Changes since take 2:
- don't check global flags if too early in process setup.
- tiny simplification in the fill pattern code

To check whether we're too early in process setup to
check global flags, I compare the arguments of RtlCreateHeap
with the ones used by the call in virtual_init().  This is
not especially clean, but I couldn't think of anything
better.  I can hear Alexandre hitting the 'd' key already,
so if anyone has a better idea, please let me know.
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