[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.

llvm-svn: 206252
diff --git a/llvm/lib/IR/Instructions.cpp b/llvm/lib/IR/Instructions.cpp
index 7d47614..5b93c53 100644
--- a/llvm/lib/IR/Instructions.cpp
+++ b/llvm/lib/IR/Instructions.cpp
@@ -732,7 +732,7 @@
   : TerminatorInst(Type::getVoidTy(IfTrue->getContext()), Instruction::Br,
                    OperandTraits<BranchInst>::op_end(this) - 1,
                    1, InsertBefore) {
-  assert(IfTrue != 0 && "Branch destination may not be null!");
+  assert(IfTrue && "Branch destination may not be null!");
   Op<-1>() = IfTrue;
 }
 BranchInst::BranchInst(BasicBlock *IfTrue, BasicBlock *IfFalse, Value *Cond,
@@ -752,7 +752,7 @@
   : TerminatorInst(Type::getVoidTy(IfTrue->getContext()), Instruction::Br,
                    OperandTraits<BranchInst>::op_end(this) - 1,
                    1, InsertAtEnd) {
-  assert(IfTrue != 0 && "Branch destination may not be null!");
+  assert(IfTrue && "Branch destination may not be null!");
   Op<-1>() = IfTrue;
 }