[heap] Avoid the use of cells to point from code to new-space objects.

test/cctest/test-serialize.cc

Index: test/cctest/test-serialize.cc
diff --git a/test/cctest/test-serialize.cc b/test/cctest/test-serialize.cc
index 141ab616d6dd9a8db2020fd5a6e8a84023708b23..f437ce3dcc79e918e649b921e29fd0bb2d9290fd 100644
--- a/test/cctest/test-serialize.cc
+++ b/test/cctest/test-serialize.cc
@@ -1854,15 +1854,19 @@ TEST(CodeSerializerCell) {
   assembler.enable_serializer();
   Handle<HeapNumber> number = isolate->factory()->NewHeapNumber(0.3);
   CHECK(isolate->heap()->InNewSpace(*number));
-  MacroAssembler* masm = &assembler;
-  masm->MoveHeapObject(rax, number);
-  masm->ret(0);
-  CodeDesc desc;
-  masm->GetCode(&desc);
-  Handle<Code> code = isolate->factory()->NewCode(
-      desc, Code::ComputeFlags(Code::FUNCTION), masm->CodeObject());
-  code->set_has_reloc_info_for_serialization(true);
-
+  Handle<Code> code;
+  {
+    MacroAssembler* masm = &assembler;
+    Handle<Cell> cell = isolate->factory()->NewCell(number);
+    masm->Move(rax, cell, RelocInfo::CELL);
+    masm->movp(rax, Operand(rax, 0));
+    masm->ret(0);
+    CodeDesc desc;
+    masm->GetCode(&desc);
+    code = isolate->factory()->NewCode(desc, Code::ComputeFlags(Code::FUNCTION),
+                                       masm->CodeObject());
+    code->set_has_reloc_info_for_serialization(true);
+  }
   RelocIterator rit1(*code, 1 << RelocInfo::CELL);
   CHECK_EQ(*number, rit1.rinfo()->target_cell()->value());