Subzero: Add a few performance measurement tools.

src/IceOperand.cpp

 //===- subzero/src/IceOperand.cpp - High-level operand implementation -----===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements the Operand class and its target-independent
@@ skipping 260 matching lines @@
   case MDS_MultiDefMultiBlock:
   case MDS_MultiDefSingleBlock:
     return NULL;
   case MDS_SingleDef:
     assert(!Definitions.empty());
     return Definitions[0];
   }
 }
 
 void VariablesMetadata::init() {
-  static TimerIdT IDvmetadata = GlobalContext::getTimerID("vmetadata");
-  TimerMarker T(IDvmetadata, Func->getContext());
+  TimerMarker T(TimerStack::TT_vmetadata, Func);
   Metadata.clear();
   Metadata.resize(Func->getNumVariables());
 
   // Mark implicit args as being used in the entry node.
   for (Variable *Var : Func->getImplicitArgs()) {
     const Inst *NoInst = NULL;
     const CfgNode *EntryNode = Func->getEntryNode();
     const bool IsFromDef = false;
     const bool IsImplicit = true;
     Metadata[Var->getIndex()].markUse(NoInst, EntryNode, IsFromDef, IsImplicit);
@@ skipping 138 matching lines @@
 void ConstantRelocatable::dump(const Cfg *, Ostream &Str) const {
   Str << "@" << Name;
   if (Offset)
     Str << "+" << Offset;
 }
 
 void LiveRange::dump(Ostream &Str) const {
   Str << "(weight=" << Weight << ") ";
   bool First = true;
   for (const RangeElementType &I : Range) {
-    if (First)
+    if (!First)
       Str << ", ";
     First = false;
     Str << "[" << I.first << ":" << I.second << ")";
   }
 }
 
 Ostream &operator<<(Ostream &Str, const LiveRange &L) {
   L.dump(Str);
   return Str;
 }
 
 Ostream &operator<<(Ostream &Str, const RegWeight &W) {
   if (W.getWeight() == RegWeight::Inf)
     Str << "Inf";
   else
     Str << W.getWeight();
   return Str;
 }
 
 } // end of namespace Ice