RFR: 8325467: Support methods with many arguments in C2 [v2]

[Daniel Lundén]

On Tue, 13 Aug 2024 19:04:26 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> No, I'll have a look and see if it makes sense to use growable arrays in this case. Thanks!
>
> Yes, it is good suggestion. Please look.

I have investigated using a `GrowableArray` now, including a discussion with people involved in their development. Currently, there are some limitations with `GrowableArray` that have a negative performance impact for our use case:
- There is no efficient copy/clone operation.
- `GrowableArray` construction currently default-initializes everything within their capacity, which is unnecessary in our case (and probably unnecessary in general as well).

Yes, one option is to implement the above for `GrowableArray`. There is, however, already an ongoing discussion on how to best do this, and there are some pitfalls. I prefer to not start a more general and largely orthogonal discussion on `GrowableArray` changes here and suggest we update my current manual allocation to use a `GrowableArray` in a separate RFE, after `GrowableArray` has the required functionality.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20404#discussion_r1722983790