Support for context-aware intervals

[rafaelsamenezes]

This PR enables the abstract domain to have more information about the context where it is invoked. Specifically, this enables:

1. Global variables
2. Reasoning about functions calls: parameters and return values.
3. Disables the interval analysis unit tests due to Goto generation in unit test is not initializing the namespace correctly #1567 (solved by PR migrate_namespace_lookup now managed by language_uit #1568)

[rafaelsamenezes]

Master

Statistics:          23805 Files
  correct:           15016
    correct true:     8444
    correct false:    6572
  incorrect:            50
    incorrect true:     17
    incorrect false:    33
  unknown:            8739
  Score:             22388 (max: 38482)

PR

Statistics:          23805 Files
  correct:           15127
    correct true:     8555
    correct false:    6572
  incorrect:            49
    incorrect true:     18
    incorrect false:    31
  unknown:            8629
  Score:             22610 (max: 38482)

[fbrausse]

In general LGTM, just a few comments.

[fbrausse]

LGTM!

[lucasccordeiro]

@rafaelsamenezes: could you please fix the CI issues here?

[rafaelsamenezes]

I changed the failing test case. It seems that the issue is related to using a function pointer. The function ptr is making the abstract interpreter confused about where is the next instruction, resulting in a bottom.

I also added the original test case as a knownbug. It seems to be related to having the function ptr call at the end of a block.