[foreign-memaccess+abi] Integrated: ValueLayouts: Improve test coverage and more

[Per Minborg]

On Fri, 10 Feb 2023 13:56:18 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR:
> 
> * Adds tests to `ValueLayout` methods
> * Simplifies an `equals()` method
> * Changes from exception throwing to assert for parameters that cannot be changed client-side

This pull request has now been integrated.

Changeset: e51a2eca
Author:    Per Minborg <pminborg at openjdk.org>
URL:       https://git.openjdk.org/panama-foreign/commit/e51a2eca250f04d55039371220bb495f1defe3ec
Stats:     63 lines in 2 files changed: 35 ins; 14 del; 14 mod

ValueLayouts: Improve test coverage and more

Reviewed-by: jvernee

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PR: https://git.openjdk.org/panama-foreign/pull/786