Add realloc support to rtrace #1062
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As a follow-up to #1061 this adds a new
onrealloccallback to RTrace, which is called in between the allocation of the new block and freeing the old block, so RC of the old block can be copied to the new block, plus performing the typical checks.Also related to the leak I mentioned in #1042 (comment).
cc @jtenner Looks like this is relevant for as-pect.