Add code-walker declaration for CCL:COMPILER-LET

Robert Goldmanrequested to merge
rgoldman/iterate:ccl-fix into master

CCL rewrites ASSERT into a complex form using CCL:COMPILER-LET.

This caused an ITERATE walker failure when ASSERT was used inside ITER on CCL. Fixed by this PR.

Note that there is a test in the PR that can be used on an unmodified ITERATE to verify the issue.

Edited by Robert Goldman

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