James O'Beirne b5c9bb5cb9 util: Restore GetIntArg saturating behavior ...

The new locale-independent atoi64 method introduced in #20452 parses
large integer values higher than maximum representable value as 0
instead of the maximum value, which breaks backwards compatibility.
This commit restores compatibility and adds test coverage for this case
in terms of the related GetIntArg and strtoll functions.

Co-authored-by: Ryan Ofsky <ryan@ofsky.org>

2022-01-11 19:54:36 -05:00

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