Subzero: Convert NULL->nullptr.

src/IceGlobalContext.cpp

 //===- subzero/src/IceGlobalContext.cpp - Global context 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 aspects of the compilation that persist across
@@ skipping 60 matching lines @@
 
 // UndefPool maps ICE types to the corresponding ConstantUndef values.
 class UndefPool {
   UndefPool(const UndefPool &) = delete;
   UndefPool &operator=(const UndefPool &) = delete;
 
 public:
   UndefPool() : NextPoolID(0), Pool(IceType_NUM) {}
 
   ConstantUndef *getOrAdd(GlobalContext *Ctx, Type Ty) {
-    if (Pool[Ty] == NULL)
+    if (Pool[Ty] == nullptr)
       Pool[Ty] = ConstantUndef::create(Ctx, Ty, NextPoolID++);
     return Pool[Ty];
   }
 
 private:
   uint32_t NextPoolID;
   std::vector<ConstantUndef *> Pool;
 };
 
 // The global constant pool bundles individual pools of each type of
@@ skipping 226 matching lines @@
     return getConstantInt8(Value);
   case IceType_i16:
     return getConstantInt16(Value);
   case IceType_i32:
     return getConstantInt32(Value);
   case IceType_i64:
     return getConstantInt64(Value);
   default:
     llvm_unreachable("Bad integer type for getConstant");
   }
-  return NULL;
+  return nullptr;
 }
 
 Constant *GlobalContext::getConstantInt1(int8_t ConstantInt1) {
   ConstantInt1 &= INT8_C(1);
   return ConstPool->Integers1.getOrAdd(this, ConstantInt1);
 }
 
 Constant *GlobalContext::getConstantInt8(int8_t ConstantInt8) {
   return ConstPool->Integers8.getOrAdd(this, ConstantInt8);
 }
@@ skipping 171 matching lines @@
 TimerMarker::TimerMarker(TimerIdT ID, const Cfg *Func)
     : ID(ID), Ctx(Func->getContext()), Active(false) {
   if (ALLOW_DUMP) {
     Active = Func->getFocusedTiming() || Ctx->getFlags().SubzeroTimingEnabled;
     if (Active)
       Ctx->pushTimer(ID);
   }
 }
 
 } // end of namespace Ice