Move kernel stats out of CPU and into XC.

arch/alpha/ev5.cc:
    Move kernel stats out of CPU and into XC.  Also be sure to check if the kernel stats exist prior to using them.

--HG--
extra : convert_revision : 565cd7026410fd7d8586f953d9b328c2e67a9473

cpu/cpu_exec_context.hh

@@ -53,6 +53,10 @@ class FunctionProfile;
 class ProfileNode;
 class MemoryController;
 
+namespace Kernel {
+    class Statistics;
+};
+
 #else // !FULL_SYSTEM
 
 #include "sim/process.hh"
@@ -147,6 +151,9 @@ class CPUExecContext
 
     void profileSample();
 
+    Kernel::Statistics *getKernelStats() { return kernelStats; }
+
+    Kernel::Statistics *kernelStats;
 #else
     Process *process;