RFR: 8313676: Amend TestLoadIndexedMismatch test to target intrinsic directly

[Tobias Hartmann]

On Thu, 3 Aug 2023 10:43:34 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> See the bug for the reasons. Basically, we want to target the intrinsic directly, to avoid the dependence on the JDK code shape.
> 
> Additional testing:
>  - [x] mainline: test is still sensitive to JDK-8313402 fix
>  - [x] 17u: test is _now_ sensitive to JDK-8313402 fix

Looks good.

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Marked as reviewed by thartmann (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/15136#pullrequestreview-1560913736