std.Io.Threaded: fix QueryPerformanceCounter usage#26021
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Thank you! Please avoid unnecessary use of var.
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Co-authored-by: Andrew Kelley <andrew@ziglang.org>
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As mentioned in #26014,
QueryPerformanceCounterdoes not return nanoseconds.This PR fixes its usage by following the existing implementation in std.time.Instant.since.
I'm not 100% about the intermediate integer types (at least it seems to work), so let me know if they should be changed.
Closes #26014