Description of changes:

Currently, Kani's overridden assert macros ignores the arguments. This may lead to not reporting errors in their usage (#803) or to report spurious unused variable warnings (#1556). This PR updates Kani's implementation of the macros to emit a dummy, unreachable block inside which the arguments are processed so that errors are captured, without affecting verification performance.

Resolved issues:

Resolves #803
Resolves #1556

Call-outs:

Testing:

• How is this change tested? Added two tests

• Is this a refactor change? No

Checklist

• Each commit message has a non-empty body, explaining why the change was made
• Methods or procedures are documented
• Regression or unit tests are included, or existing tests cover the modified code
• My PR is restricted to a single feature or bugfix

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.