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(parent: d1c5752) | patch

Correctly handle test durations of more than 2147s in pg_test_timing.

Correctly handle test durations of more than 2147s in pg_test_timing.

Previously the computation of the total test duration, measured in
microseconds, accidentally overflowed due to accidentally using signed
32bit arithmetic. As the only consequence is that pg_test_timing
invocations with such, overly large, durations never finished the
practical consequences of this bug are minor.

Pointed out by Coverity.

Backpatch to 9.2 where pg_test_timing was added.

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