[GR-64844] Fix adapting of loop exit probabilities. #11204
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This PR fixes adapting loop exit probabilities based on a provided frequency of 1 (for head counted loops). This would result in a loop where the loop exit probability is considered the likely path.
Using a frequency of 2 (for head counted loops) would actually result in the loop entered and loop exit probabilities both being 0.5, and thus, the loop expected to be entered exactly once.