FunctionTags goal is to solve the long-standing problem of identifying
what type of function are we dealing with. Is it a lifted function? An
helper?
Now we have a sane way to determine this using Metadata and a proper
API.
FunctionIsolation used to base its work on calls to the marker function
`function_call`, as opposed to information provided by the StackAnalysis
(i.e., `revng.member.type` along with `func.call`).
This also affected EnforceABI, which took care of finishing the work
left over by FunctionIsolation. This was hackish and inelegant.
This commit makes FunctionIsolation work exclusively employing
information from StackAnalysis and purges away code that is no longer
necessary from EnforceABI.
Alessandro Di Federico