[heap] Disallow allocation on the last page in address range

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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 4888 matching lines @@
   // Calculate new top and bail out if new space is exhausted.
   ExternalReference allocation_limit =
       AllocationUtils::GetAllocationLimitReference(isolate(), flags);
 
   Register top_reg = result_end.is_valid() ? result_end : result;
 
   if (!top_reg.is(result)) {
     movp(top_reg, result);
   }
   addp(top_reg, Immediate(object_size));
-  j(carry, gc_required);
   Operand limit_operand = ExternalOperand(allocation_limit);
   cmpp(top_reg, limit_operand);
   j(above, gc_required);
 
   // Update allocation top.
   UpdateAllocationTopHelper(top_reg, scratch, flags);
 
   bool tag_result = (flags & TAG_OBJECT) != 0;
   if (top_reg.is(result)) {
     if (tag_result) {
@@ skipping 784 matching lines @@
   movl(rax, dividend);
   shrl(rax, Immediate(31));
   addl(rdx, rax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64