Recognize malloc/calloc/realloc in local_bitvector_analysist

[tautschnig]

Teach local_bitvector_analysis to recognize malloc, calloc, and realloc as returning dynamic heap pointers. This lets goto_check_c generate more precise pointer checks (e.g., using dynamic object bounds instead of generic object bounds).

Impact on array_test_add: 312 -> 308 generated properties.

• Each commit message has a non-empty body, explaining why the change was made.
• Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• n/a The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• n/a White-space or formatting changes outside the feature-related changed lines are in commits of their own.

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