[foreign-memaccess+abi] Integrated: Simplify code now that bitSize is always aligned to byte boundaries

[Per Minborg]

On Wed, 15 Feb 2023 12:54:37 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR suggests some simplifications now that layouts are always aligned to byte boundaries. 
> 
> The PR also contains some other simplifications/cleanups.

This pull request has now been integrated.

Changeset: 2c378000
Author:    Per Minborg <pminborg at openjdk.org>
URL:       https://git.openjdk.org/panama-foreign/commit/2c378000405d65345bb799bccdc1facc06b63f8d
Stats:     64 lines in 7 files changed: 9 ins; 20 del; 35 mod

Simplify code now that bitSize is always aligned to byte boundaries

Reviewed-by: mcimadamore

-------------

PR: https://git.openjdk.org/panama-foreign/pull/796