mem-cache: Fixes to PIF prefetcher

mem-cache: Fixes to PIF prefetcher

The temporal compactor was never initialized.

There were more possible indexes to the prec/succ vectors than
entries, so a block distance of zero would seg fault.

When checking for an address the wrong vector was being used.

From the original paper, "The prediction mechanism searches for
the PC of the accessed instruction in the index table"

Change-Id: I3c3aceac3c0adbbe8aef5c634c88cb35ba7487be
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/28487
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>