Subzero: Improve debugging controls, plus minor refactoring.

src/IceInstX8632.cpp

 //===- subzero/src/IceInstX8632.cpp - X86-32 instruction 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 InstX8632 and OperandX8632 classes,
@@ skipping 118 matching lines @@
   addSource(Dest);
   addSource(Source1);
   addSource(Source2);
 }
 
 InstX8632Label::InstX8632Label(Cfg *Func, TargetX8632 *Target)
     : InstX8632(Func, InstX8632::Label, 0, NULL),
       Number(Target->makeNextLabelNumber()) {}
 
 IceString InstX8632Label::getName(const Cfg *Func) const {
-  char buf[30];
-  snprintf(buf, llvm::array_lengthof(buf), "%u", Number);
-  return ".L" + Func->getFunctionName() + "$local$__" + buf;
+  return ".L" + Func->getFunctionName() + "$local$__" + std::to_string(Number);
 }
 
 InstX8632Br::InstX8632Br(Cfg *Func, const CfgNode *TargetTrue,
                          const CfgNode *TargetFalse,
                          const InstX8632Label *Label, CondX86::BrCond Condition)
     : InstX8632(Func, InstX8632::Br, 0, NULL), Condition(Condition),
       TargetTrue(TargetTrue), TargetFalse(TargetFalse), Label(Label) {}
 
 bool InstX8632Br::optimizeBranch(const CfgNode *NextNode) {
   // If there is no next block, then there can be no fallthrough to
@@ skipping 2724 matching lines @@
   }
   Str << "(";
   if (Func)
     Var->dump(Func);
   else
     Var->dump(Str);
   Str << ")";
 }
 
 } // end of namespace Ice