[m-rev.] for post-commit review: fix NumCodeUnits != FileStringLen aborts in C#

[Zoltan Somogyi]

For review by Peter.

Zoltan.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Log.numcus
Type: application/octet-stream
Size: 1098 bytes
Desc: not available
URL: <http://lists.mercurylang.org/archives/reviews/attachments/20220311/6967255c/attachment.obj>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: DIFF.numcus
Type: application/octet-stream
Size: 6958 bytes
Desc: not available
URL: <http://lists.mercurylang.org/archives/reviews/attachments/20220311/6967255c/attachment-0001.obj>