Integrated: 8338717: GenShen: Fix up some assertions

[Y. Srinivas Ramakrishna]

On Wed, 21 Aug 2024 08:17:34 GMT, Y. Srinivas Ramakrishna <ysr at openjdk.org> wrote:

> In https://github.com/openjdk/jdk/pull/20395 Aleksey provided some suggestions for improving various assertions. This ticket gathers together several of those changes.
> 
> **Testing:**
> - [x] GHA
> - [x] jtreg:tier1
> - [x] Codepipeline (investigating what appears to be an unrelated failure I encountered in testing)
> - [x] SPECjbb w/GenShen (in progress)

This pull request has now been integrated.

Changeset: d7e22354
Author:    Y. Srinivas Ramakrishna <ysr at openjdk.org>
URL:       https://git.openjdk.org/shenandoah/commit/d7e22354f30a1260fc55006cafe8fd80bdad9e04
Stats:     74 lines in 9 files changed: 49 ins; 8 del; 17 mod

8338717: GenShen: Fix up some assertions

Reviewed-by: shade, wkemper

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PR: https://git.openjdk.org/shenandoah/pull/478