Subzero: Allow builds with assertions disabled.

src/IceTimerTree.cpp

 //===- subzero/src/IceTimerTree.cpp - Pass timer defs ---------------------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file defines the TimerTree class, which tracks flat and
 // cumulative execution time collection of call chains.
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/Support/Timer.h"
+
 #include "IceDefs.h"
 #include "IceTimerTree.h"
 
 namespace Ice {
 
 std::vector<IceString> TimerStack::IDs;
 
 TimerStack::TimerStack(const IceString &TopLevelName)
     : FirstTimestamp(timestamp()), LastTimestamp(FirstTimestamp),
       StateChangeCount(0), StackTop(0) {
@@ skipping 107 matching lines @@
   dumpHelper(Str, CumulativeMap, TotalTime);
   Str << "Flat function times:\n";
   DumpMapType FlatMap;
   for (TimerIdT i = 0; i < LeafTimes.size(); ++i) {
     FlatMap.insert(std::make_pair(LeafTimes[i], IDs[i]));
   }
   dumpHelper(Str, FlatMap, TotalTime);
   Str << "Number of timer updates: " << StateChangeCount << "\n";
 }
 
+double TimerStack::timestamp() {
+  // TODO: Implement in terms of std::chrono for C++11.
+  return llvm::TimeRecord::getCurrentTime(false).getWallTime();
+}
+
 } // end of namespace Ice