Describe the bug
Indirect Memory Prefetcher does not work as expected.
Even if max_prefetch_distance is bigger than 1, it only performs a single indirect prefetch.

Affects version
Since the version Indirect Memory Prefetcher was added,
to the current develop branch (c54039d).

gem5 Modifications
None

To Reproduce

Expected behavior

If I understand the paper correctly, the prefetcher should perform multiple indirect prefetch.
The code would be something like:

 for (int delta = 1; delta < distance; delta += 1) {
     Addr index = pfi.getData(b_base_address + b_item_size * delta) // value of B[i + delta]
     Addr pf_addr = pt_entry->baseAddr + 
         (index << pt_entry->shift); 
     addresses.push_back(AddrPriority(pf_addr, 0)); 
 } 

At least, I guess it doesn't make sense to push the same address to addresses.

Host Operating System
N/A

Host ISA
N/A

Compiler used
N/A

Additional information
None