mem: fix cache stats to use request ids correctly

This patch fixes the cache stats to use the new request ids.
Cache stats also display the requestor names in the vector subnames.
Most cache stats now include "nozero" and "nonan" flags to reduce the
amount of excessive cache stat dump. Also, simplified
incMissCount()/incHitCount() functions.

src/mem/cache/BaseCache.py

@@ -27,7 +27,7 @@
 # Authors: Nathan Binkert
 
 from m5.params import *
-from m5.proxy import Self
+from m5.proxy import *
 from MemObject import MemObject
 from Prefetcher import BasePrefetcher
 
@@ -44,7 +44,6 @@ class BaseCache(MemObject):
     prioritizeRequests = Param.Bool(False,
         "always service demand misses first")
     repl = Param.Repl(NULL, "replacement policy")
-    num_cpus =  Param.Int(1, "number of cpus sharing this cache")
     size = Param.MemorySize("capacity in bytes")
     forward_snoops = Param.Bool(True,
         "forward snoops from mem side to cpu side")
@@ -62,3 +61,4 @@ class BaseCache(MemObject):
     cpu_side = Port("Port on side closer to CPU")
     mem_side = Port("Port on side closer to MEM")
     addr_range = Param.AddrRange(AllMemory, "The address range for the CPU-side port")
+    system = Param.System(Parent.any, "System we belong to")