RFR: 8273239: Standardize Ticks APIs return type [v2]

[Albert Mingkun Yang]

On Tue, 7 Sep 2021 17:27:00 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Simple change on return types of Ticks API.
>> 
>> The call of `milliseconds()` in `spinYield.cpp` seems a bug to me, because the unit in the message is `usecs`. Therefore, I changed it to `microseconds()`.
>> 
>> Test: tier1
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   template

Thank you for the patch; it's easier to discuss over a concrete implementation.

> NANOSECS_PER_SEC / (uint64_t)Rdtsc::frequency();

This integer division could cause precision loss when `T` is `double`, right?

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PR: https://git.openjdk.java.net/jdk/pull/5332