X87: Reland "Merge cellspace into old pointer space".

src/x87/code-stubs-x87.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_X87
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 2434 matching lines @@
     __ mov(scratch, Operand(esp, 0 * kPointerSize));
     __ sub(scratch, Operand(esp, 1 * kPointerSize));
     if (FLAG_debug_code) {
       __ cmpb(Operand(scratch, 0), kCmpEdiOperandByte1);
       __ Assert(equal, kInstanceofStubUnexpectedCallSiteCacheCmp1);
       __ cmpb(Operand(scratch, 1), kCmpEdiOperandByte2);
       __ Assert(equal, kInstanceofStubUnexpectedCallSiteCacheCmp2);
     }
     __ mov(scratch, Operand(scratch, kDeltaToCmpImmediate));
     __ mov(Operand(scratch, 0), map);
+    __ push(map);
+    // Scratch points at the cell payload. Calculate the start of the object.
+    __ sub(scratch, Immediate(Cell::kValueOffset - 1));
+    __ RecordWriteField(scratch, Cell::kValueOffset, map, function,
+                        kDontSaveFPRegs, OMIT_REMEMBERED_SET, OMIT_SMI_CHECK);
+    __ pop(map);
   }
 
   // Loop through the prototype chain of the object looking for the function
   // prototype.
   __ mov(scratch, FieldOperand(map, Map::kPrototypeOffset));
   Label loop, is_instance, is_not_instance;
   __ bind(&loop);
   __ cmp(scratch, prototype);
   __ j(equal, &is_instance, Label::kNear);
   Factory* factory = isolate()->factory();
@@ skipping 2596 matching lines @@
                            ApiParameterOperand(2), kStackSpace, nullptr,
                            Operand(ebp, 7 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X87