Detect memory deallocation at offset from memory start #1139
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This PR is supposed to improve Goblint's detection of
invalid-free
bugs by adding a check for memory deallocation which happens at an offset from the memory's start address instead of at the start address itself.Added a few more regression test cases for this as well.
make test
runs through successfullyCf. https://cwe.mitre.org/data/definitions/761.html