RFR: 8312262: Klass::array_klass() should return ArrayKlass pointer

[Dean Long]

On Thu, 27 Jul 2023 19:22:52 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> This is a simple change to make array_klass() return ArrayKlass (the first dimension of TypeArrayKlass is a TypeArrayKlass so can't use ObjArrayKlass), higher_dimension is always an ObjArrayKlass and lower_dimension can be a TypeArrayKlass.  The change removes some casts.
> Tested with tier1 linux/macosx/windows on x86 and aarch64.

Marked as reviewed by dlong (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/15059#pullrequestreview-1550700621