RFR: 8297539: Use PrimitiveConversions::cast for local uses of the int<->float union conversion trick [v4]

[David Holmes]

On Fri, 31 Mar 2023 09:24:52 GMT, Afshin Zafari <duke at openjdk.org> wrote:

>> **Only** the instances of using `union` for converting `int` to `float` are replaced with call to `PrimitiveConversions::cast<To>(From)` method. Some few cases with conversion of `long` <->`double` are also replaced with `PrimitiveConversions::cast<To>(From)`. The other instances where the union contains other types of fields than `int` and `float` are left unchanged.
>> 
>> ### Test
>> local hotspot:tier1
>> mach5 tiers 1-5
>
> Afshin Zafari has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8297539: Use PrimitiveConversions::cast for local uses of the int<->float union conversion trick

Marked as reviewed by dholmes (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/13136#pullrequestreview-1367783212