Enable arraycmp and arraycmplen uniformly

[Spencer-Comin]

For all platforms where arraycmp and arraycmplen are supported, do not call setSupportsArrayCmp(Len) when either

• arraylets can be generated
• the TR_DisableArrayCmp(Len) environment variable is set

See eclipse-openj9/openj9#16662 (comment)
Relies on #6983, leaving this as draft until that goes through

[Spencer-Comin]

@jdmpapin @r30shah fyi

[r30shah]

Wondering if we should add third function to OMRCodeGenerator that can reset the flag for supporting arrayCmp ?
Reason I am thinking it would be beneficial to do so is that, we can then have this code in common code-gen and the platform which does not support arrayCmp can reset it.

That being said, I am OK with this set of changes, it just seems repeated change on all code-gen.

Also @VermaSh Would appreciate if you can comment on how things would be with off-heap.

[r30shah]

@Spencer-Comin Is there anything needed to be done for this?

@VermaSh Ping for comment about off-heap.

[Spencer-Comin]

Is there anything needed to be done for this?

Assuming no changes need to be made for off-heap, this is good to go

[VermaSh]

Sorry I missed this. From a quick glance at the array compare evaluators, all it needs is contiguously allocated arrays. So in the off heap world, we could just replace the base address with pointer to off heap contiguously allocated data portion. This would simply be generating IL to load dataAddr field from array header. The API to check if off heap is enabled hasn't been checked upstream yet so this is for now.

[jdmpapin]

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