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

[Quan Anh Mai]

On Wed, 17 May 2023 16:43:06 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Quan Anh Mai has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   add benchmark
>
> Is it possible to do this in `c2_MacroAssembler_x86` instead (as for `verified_entry`)?
> We are trying to move complex coding from .ad files to macroassembler.

@vnkozlov Yes we can explicitly define a stub without relying on code generation, it may be more preferable since it avoids adding complexity to adlc generation. The only downside is that there is some boilerplate for each usage but I think the boilerplate is not too terrible.

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PR Comment: https://git.openjdk.org/jdk/pull/13602#issuecomment-1551869074