RFR: 8306706: Support out-of-line code generation for MachNodes [v2]

[Quan Anh Mai]

On Wed, 17 May 2023 11:42:02 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> Quan Anh Mai has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   add benchmark
>
> Great work. I'm just wondering if the extra complexity is justified for optimizing only the floating point conversions. Do you plan to use this for other optimizations?

@TobiHartmann Thanks for taking a look, I think this can be used for the vectorized version of these nodes, as well as the max, min nodes for floating point numbers. I also see compact header uses out-of-line code to slow path `LoadNKlass`.

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PR Comment: https://git.openjdk.org/jdk/pull/13602#issuecomment-1551489783