Rollup merge of #157328 - mathisbot:opt-std-windows-time, r=ChrisDenton

windows: Elide division-by-zero checks in Instant::now()

This PR teaches LLVM that the frequency of the performance counter is non null so it is able to remove division by zero checks.
This removes the panic path in `mul_div_u64` and should make calls to `Instant::now()` (very slightly) faster.

As seen in the assembly (see godbolt below), telling LLVM that the frequency is non zero suffices to get the optimization, but I don't know if it could be a great idea to also update the signature of `mul_div_u64`?

MSDN page for [QueryPerformanceFrequency](https://learn.microsoft.com/en-us/windows/win32/api/profileapi/nf-profileapi-queryperformancefrequency):
> On systems that run Windows XP or later, the function will always succeed when given valid parameters and will thus never return zero.

Godbolt: https://rust.godbolt.org/z/xr6x8MrPE