[test] Test expectations in cctest should use CHECK and not DCHECK.

test/cctest/compiler/test-machine-operator-reducer.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // TODO(jochen): Remove this after the setting is turned on globally.
 #define V8_IMMINENT_DEPRECATION_WARNINGS
 
 #include "src/base/utils/random-number-generator.h"
 #include "src/codegen.h"
 #include "src/compiler/js-graph.h"
@@ skipping 344 matching lines @@
   R.CheckDontPutConstantOnRight(44);
 
   Node* x = R.Parameter();
   Node* zero = R.Constant<int32_t>(0);
 
   R.CheckBinop(x, x, zero);  // x >> 0  => x
 }
 
 
 static void CheckJsShift(ReducerTester* R) {
-  DCHECK(R->machine.Word32ShiftIsSafe());
+  CHECK(R->machine.Word32ShiftIsSafe());
 
   Node* x = R->Parameter(0);
   Node* y = R->Parameter(1);
   Node* thirty_one = R->Constant<int32_t>(0x1f);
   Node* y_and_thirty_one =
       R->graph.NewNode(R->machine.Word32And(), y, thirty_one);
 
   // If the underlying machine shift instructions 'and' their right operand
   // with 0x1f then:  x << (y & 0x1f) => x << y
   R->CheckFoldBinop(x, y, x, y_and_thirty_one);
@@ skipping 372 matching lines @@
 // TODO(titzer): test MachineOperatorReducer for Float64Compare
 // TODO(titzer): test MachineOperatorReducer for Float64Add
 // TODO(titzer): test MachineOperatorReducer for Float64Sub
 // TODO(titzer): test MachineOperatorReducer for Float64Mul
 // TODO(titzer): test MachineOperatorReducer for Float64Div
 // TODO(titzer): test MachineOperatorReducer for Float64Mod
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8