Remove "extra checks"

src/x64/macro-assembler-x64.cc

 // Copyright 2012 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 "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 781 matching lines @@
   cmpp(prev_limit_reg, Operand(base_reg, kLimitOffset));
   j(not_equal, &delete_allocated_handles);
   bind(&leave_exit_frame);
 
   // Check if the function scheduled an exception.
   Move(rsi, scheduled_exception_address);
   Cmp(Operand(rsi, 0), factory->the_hole_value());
   j(not_equal, &promote_scheduled_exception);
   bind(&exception_handled);
 
-#if ENABLE_EXTRA_CHECKS
+#if DEBUG
   // Check if the function returned a valid JavaScript value.
   Label ok;
   Register return_value = rax;
   Register map = rcx;
 
   JumpIfSmi(return_value, &ok, Label::kNear);
   movp(map, FieldOperand(return_value, HeapObject::kMapOffset));
 
   CmpInstanceType(map, FIRST_NONSTRING_TYPE);
   j(below, &ok, Label::kNear);
@@ skipping 4583 matching lines @@
   if (mag.shift > 0) sarl(rdx, Immediate(mag.shift));
   movl(rax, dividend);
   shrl(rax, Immediate(31));
   addl(rdx, rax);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64