[7.5.0] Use long instead of int for thread indices #24866
Merged
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This protects against an integer overflow which could occur for large key list size and large thread counts.
Regrettably, it's difficult to write a regression test for this scenario, as exercising this overflow requires lots of time and heap, so it would be a performance regression to our test suites.
Fixes #19445
PiperOrigin-RevId: 595420516
Change-Id: Ic0a475a6a273c50fe9895dd0852fa5b062859cb2
Commit 3e373d0