[CIR][CodeGen] Fix catch-all dispatch and multiple destructor calls

[bruteforceboy]

This PR has two parts:

1. Mimicking the OG special case for a single catch-all when getting dispatch blocks. The huge testcase I added, gotten by using creduce on a c++ file, crashed at this point in our version.
2. Fixing multiple destructor calls for the same object. For example, there were tests like #1 and #2, having a second destructor call to an already destroyed object. This PR fixes these and I have updated the tests. Also, I added "CIR-NEXT" at some points, to confirm the destructors are indeed called once.

As usual, please let me know if you have any concerns.

[bcardosolopes]

Overall looks great, thanks! One clarifying question