RFR: 8370983: Add methods for primitive operators to support method handles

[Joe Darcy]

On Fri, 31 Oct 2025 16:42:37 GMT, Hannes Greule <hgreule at openjdk.org> wrote:

> I definitely like to see easier ways to construct method handles for specific operators, mainly the mathematical ones.
> 
> Some you've currently included are already present in `MethodHandles`, e.g., `arrayElementGetter` and `arrayElementSetter` for the array store and load bytecodes. `throwException` exists as well. You could also argue that `zero(void.class)` can be used as a nop.
> 
> The increment and decrement bytecodes are also somewhat weird, because you can't really observe them this way.
> 
> The conversion opcodes (x2y) can also be represented using `identity(x)` + `asType((x)y)`, but more explicit representation of that might be interesting.

Hmm. I do expect a few iterations on this PR before the set of operations/methods converges. I've added links to related elements in `MethodHandles` thanks.

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PR Comment: https://git.openjdk.org/jdk/pull/28081#issuecomment-3474878695