2e0ded3371
Fixes https://github.com/llvm/llvm-project/issues/105813 and
https://github.com/llvm/llvm-project/issues/106915.
Adds a check for the end of the iterator, which can be a sentinel.
The issue was introduced in
0efe111365
from what I can see, so along with the introduction of /EHa support.