RFR (S) 8247615: Initialize the bytes left for the heap sampler

[Man Cao]

Thanks for fixing this!

> 53 ThreadHeapSampler() : _bytes_until_sample(get_sampling_interval())  {

Does this work better? (It has to be done after the initialization of _rnd.)
_bytes_until_sample = pick_next_sample();

It could avoid completely missing to sample the first 512K allocation.
It could also avoid the problem where every thread deterministically
allocates the same object at 512K, although this is unlikely.

-Man
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