Rename IS_REF_OR_VAL_SIGNATURE to IS_CLASS_SIGNATURE

[theresa-m]

• Rename IS_REF_OR_VAL_SIGNATURE to IS_CLASS_SIGNATURE
• Rename isRefOrValSignature to isClassSignature

These names refer to ReferenceType from an old value types specification draft which is no longer in use https://cr.openjdk.org/~dlsmith/jep401/jep401-20211220/specs/primitive-classes-jvms.html#jvms-4.3.2. Rename these to reflect the current meaning.

Related to #18157

[keithc-ca]

Is "class" the right concept, or should it be "type"?

[theresa-m]

Is "class" the right concept, or should it be "type"?

Its referring to ClassType so maybe IS_CLASSTYPE_SIGNATURE ?

But given that this language isn't used much in the jvm spec I think IS_CLASS_SIGNATURE is sufficiently descriptive.

[keithc-ca]

It's my understanding that Valhalla is working towards removing the distinction between class types and value types, so while "ClassType" is better, I think "Type" is more general (the type in question may not be a "class" as the name would imply).

[theresa-m]

I see what you mean, but currently the "regular classes" are known as identity classes and value types are value classes. Class encompasses both types.

[keithc-ca]

Ok, then "class" is fine. Thanks.

[keithc-ca]

Please address the merge conflict.

[keithc-ca]

Jenkins test sanity amac jdk23

[hangshao0]

Jenkins test sanity.functional,extended zlinuxval jdknext