ruby: profiler: statically allocate stats variable

Couple of users observed segmentation fault when the simulator tries to
register the statistical variable m_IncompleteTimes.  It seems that there
is some problem with the initialization of these variables when allocated
in the constructor.

src/mem/ruby/profiler/Profiler.cc

@@ -62,7 +62,6 @@ using namespace std;
 using m5::stl_helpers::operator<<;
 
 Profiler::Profiler(const RubySystemParams *p)
-    : m_IncompleteTimes(MachineType_NUM)
 {
     m_hot_lines = p->hot_lines;
     m_all_instructions = p->all_instructions;

src/mem/ruby/profiler/Profiler.hh

@@ -125,7 +125,7 @@ class Profiler
     std::vector<Stats::Histogram *> m_InitialToForwardDelayHist;
     std::vector<Stats::Histogram *> m_ForwardToFirstResponseDelayHist;
     std::vector<Stats::Histogram *> m_FirstResponseToCompletionDelayHist;
-    std::vector<Stats::Scalar> m_IncompleteTimes;
+    Stats::Scalar m_IncompleteTimes[MachineType_NUM];
 
     //added by SS
     bool m_hot_lines;