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Improve KeepRunning loop performance to be similar to the range-based for. (#460)

This patch improves the performance of the KeepRunning loop in two ways:

(A) it removes the dependency on the max_iterations variable, preventing
it from being loaded every iteration.

(B) it loops to zero, instead of to an upper bound. This allows a single
decrement instruction to be used instead of a arithmetic op followed by a
comparison.

6 of 6 new or added lines in 2 files covered. (100.0%)

1418 of 1626 relevant lines covered (87.21%)

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