fix windows after r18847

src/x64/macro-assembler-x64.cc

 // Copyright 2012 the V8 project authors. 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 679 matching lines @@
   const int kNextOffset = 0;
   const int kLimitOffset = Offset(
       ExternalReference::handle_scope_limit_address(isolate()),
       next_address);
   const int kLevelOffset = Offset(
       ExternalReference::handle_scope_level_address(isolate()),
       next_address);
   ExternalReference scheduled_exception_address =
       ExternalReference::scheduled_exception_address(isolate());
 
-  ASSERT(rdx.is(function_address));
+  ASSERT(rdx.is(function_address) || r8.is(function_address));
   // Allocate HandleScope in callee-save registers.
   Register prev_next_address_reg = r14;
   Register prev_limit_reg = rbx;
   Register base_reg = r15;
   Move(base_reg, next_address);
   movp(prev_next_address_reg, Operand(base_reg, kNextOffset));
   movp(prev_limit_reg, Operand(base_reg, kLimitOffset));
   addl(Operand(base_reg, kLevelOffset), Immediate(1));
 
   if (FLAG_log_timer_events) {
@@ skipping 4282 matching lines @@
   j(equal, found);
   movp(current, FieldOperand(current, Map::kPrototypeOffset));
   CompareRoot(current, Heap::kNullValueRootIndex);
   j(not_equal, &loop_again);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64