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

src/x64/disasm-x64.cc

 // Copyright 2011 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.
 
 #include <assert.h>
 #include <stdarg.h>
 #include <stdio.h>
 
 #include "src/v8.h"
 
@@ skipping 785 matching lines @@
       case 5:
         mnem = "shr";
         break;
       case 7:
         mnem = "sar";
         break;
       default:
         UnimplementedInstruction();
         return count + 1;
     }
-    DCHECK_NE(NULL, mnem);
+    DCHECK_NOT_NULL(mnem);
     AppendToBuffer("%s%c ", mnem, operand_size_code());
   }
   count += PrintRightOperand(data + count);
   if (op == 0xD2) {
     AppendToBuffer(", cl");
   } else {
     int imm8 = -1;
     if (op == 0xD0) {
       imm8 = 1;
     } else {
@@ skipping 1294 matching lines @@
     for (int i = 6 - static_cast<int>(pc - prev_pc); i >= 0; i--) {
       fprintf(f, "  ");
     }
     fprintf(f, "  %s\n", buffer.start());
   }
 }
 
 }  // namespace disasm
 
 #endif  // V8_TARGET_ARCH_X64