Subzero: Improve the use of NodeList objects.

src/PNaClTranslator.cpp

 //===- subzero/src/PNaClTranslator.cpp - ICE from bitcode -----------------===//
 //
 //                        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 PNaCl bitcode file to Ice, to machine code
@@ skipping 1619 matching lines @@
   raw_string_ostream StrBuf(Buffer);
   StrBuf << "Binary opcode " << Opcode << "not understood for type " << Ty;
   Error(StrBuf.str());
 }
 
 void FunctionParser::ExitBlock() {
   // Before translating, check for blocks without instructions, and
   // insert unreachable. This shouldn't happen, but be safe.
   unsigned Index = 0;
   for (Ice::CfgNode *Node : Func->getNodes()) {
-    if (Node->getInsts().size() == 0) {
+    if (Node->getInsts().empty()) {
       std::string Buffer;
       raw_string_ostream StrBuf(Buffer);
       StrBuf << "Basic block " << Index << " contains no instructions";
       Error(StrBuf.str());
       // TODO(kschimpf) Remove error recovery once implementation complete.
       Node->appendInst(Ice::InstUnreachable::create(Func));
     }
     ++Index;
   }
   Func->computePredecessors();
@@ skipping 250 matching lines @@
       Error(StrBuf.str());
       appendErrorInstruction(DestType);
       return;
     }
     return;
   }
   case naclbitc::FUNC_CODE_INST_RET: {
     // RET: [opval?]
     if (!isValidRecordSizeInRange(0, 1, "function block ret"))
       return;
-    if (Values.size() == 0) {
+    if (Values.empty()) {
       CurrentNode->appendInst(Ice::InstRet::create(Func));
     } else {
       CurrentNode->appendInst(
           Ice::InstRet::create(Func, getRelativeOperand(Values[0], BaseIndex)));
     }
     InstIsTerminating = true;
     return;
   }
   case naclbitc::FUNC_CODE_INST_BR: {
     if (Values.size() == 1) {
@@ skipping 760 matching lines @@
 
   if (TopLevelBlocks != 1) {
     errs() << IRFilename
            << ": Contains more than one module. Found: " << TopLevelBlocks
            << "\n";
     ErrorStatus = true;
   }
 }
 
 } // end of namespace Ice