Initial switch to Chromium-style CHECK_* and DCHECK_* macros.

src/compiler/simplified-operator.cc

Index: src/compiler/simplified-operator.cc
diff --git a/src/compiler/simplified-operator.cc b/src/compiler/simplified-operator.cc
index e1e8c30aad64a1aac99ebb45d1db8d35b00ff595..57cc0ad6dba8f115754ba16ce88ba29a1c0eddb0 100644
--- a/src/compiler/simplified-operator.cc
+++ b/src/compiler/simplified-operator.cc
@@ -142,7 +142,7 @@ std::ostream& operator<<(std::ostream& os, ElementAccess const& access) {
 
 
 const FieldAccess& FieldAccessOf(const Operator* op) {
-  DCHECK_NOT_NULL(op);
+  DCHECK(op);
   DCHECK(op->opcode() == IrOpcode::kLoadField ||
          op->opcode() == IrOpcode::kStoreField);
   return OpParameter<FieldAccess>(op);
@@ -150,7 +150,7 @@ const FieldAccess& FieldAccessOf(const Operator* op) {
 
 
 const ElementAccess& ElementAccessOf(const Operator* op) {
-  DCHECK_NOT_NULL(op);
+  DCHECK(op);
   DCHECK(op->opcode() == IrOpcode::kLoadElement ||
          op->opcode() == IrOpcode::kStoreElement);
   return OpParameter<ElementAccess>(op);