Always pass an Isolate to AssemblerBase

src/assembler.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 155 matching lines @@
 
 AssemblerBase::AssemblerBase(Isolate* isolate, void* buffer, int buffer_size)
     : isolate_(isolate),
       jit_cookie_(0),
       enabled_cpu_features_(0),
       emit_debug_code_(FLAG_debug_code),
       predictable_code_size_(false),
       // We may use the assembler without an isolate.
       serializer_enabled_(isolate && isolate->serializer_enabled()),
       constant_pool_available_(false) {
-  if (FLAG_mask_constants_with_cookie && isolate != NULL)  {
+  DCHECK_NOT_NULL(isolate);
+  if (FLAG_mask_constants_with_cookie) {
     jit_cookie_ = isolate->random_number_generator()->NextInt();
   }
   own_buffer_ = buffer == NULL;
   if (buffer_size == 0) buffer_size = kMinimalBufferSize;
   DCHECK(buffer_size > 0);
   if (own_buffer_) buffer = NewArray<byte>(buffer_size);
   buffer_ = static_cast<byte*>(buffer);
   buffer_size_ = buffer_size;
 
   pc_ = buffer_;
@@ skipping 1718 matching lines @@
 
 
 void Assembler::DataAlign(int m) {
   DCHECK(m >= 2 && base::bits::IsPowerOfTwo32(m));
   while ((pc_offset() & (m - 1)) != 0) {
     db(0);
   }
 }
 }  // namespace internal
 }  // namespace v8