RFR: 8349860: Make Class.isArray(), Class.isInterface() and Class.isPrimitive() non-native

[Claes Redestad]

On Tue, 11 Feb 2025 20:56:39 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> Class.isInterface() can check modifier flags, Class.isArray() can check whether component mirror is non-null and Class.isPrimitive() needs a new final transient boolean in java.lang.Class that the JVM code initializes.
> Tested with tier1-4 and performance tests.

Touching `Wrapper` seems out of scope for this PR, but if `Class.isPrimitive` gets cheaper from this then `Wrapper.forPrimitiveType` should definitely be examined in a follow-up.

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PR Comment: https://git.openjdk.org/jdk/pull/23572#issuecomment-2661970849