Fix for m_alignpad == 0 assertion failure

[mrsharm]

Fixes #70231 by:

1. Removing the demotion check
2. Adding a null check on the GCSafeMethodTable

Also, we are now logging the m_alignpad value instead of the object address in the IllegalAlignPad function.

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Issue Details

---

Fixes #70231 by:

1. Removing the demotion check
2. Adding a null check on the GCSafeMethodTable

Also, we are now logging the m_alignpad value instead of the object address in the IllegalAlignPad function.

Author:	mrsharm
Assignees:	-
Labels:	area-GC-coreclr
Milestone:	-

[Maoni0]

does the LogSpewAlways actually log something in the stress log the way these tests are run? when I looked at the dumps this message was not there.