X87: Reland [heap] Avoid the use of cells to point from code to new-space objects.

src/x87/assembler-x87-inl.h

Index: src/x87/assembler-x87-inl.h
diff --git a/src/x87/assembler-x87-inl.h b/src/x87/assembler-x87-inl.h
index 779feeb90749464fd9e97acf7af4d8e5845c9855..bbf712b933d95d499fc197c1604cb84f860c459b 100644
--- a/src/x87/assembler-x87-inl.h
+++ b/src/x87/assembler-x87-inl.h
@@ -138,8 +138,6 @@ void RelocInfo::set_target_object(Object* target,
   if (write_barrier_mode == UPDATE_WRITE_BARRIER &&
       host() != NULL &&
       target->IsHeapObject()) {
-    host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(
-        host(), this, HeapObject::cast(target));
     host()->GetHeap()->RecordWriteIntoCode(host(), this, target);
   }
 }
@@ -343,7 +341,6 @@ Immediate::Immediate(Handle<Object> handle) {
   // Verify all Objects referred by code are NOT in new space.
   Object* obj = *handle;
   if (obj->IsHeapObject()) {
-    DCHECK(!HeapObject::cast(obj)->GetHeap()->InNewSpace(obj));
     x_ = reinterpret_cast<intptr_t>(handle.location());
     rmode_ = RelocInfo::EMBEDDED_OBJECT;
   } else {
@@ -382,7 +379,6 @@ void Assembler::emit(Handle<Object> handle) {
   AllowDeferredHandleDereference heap_object_check;
   // Verify all Objects referred by code are NOT in new space.
   Object* obj = *handle;
-  DCHECK(!isolate()->heap()->InNewSpace(obj));
   if (obj->IsHeapObject()) {
     emit(reinterpret_cast<intptr_t>(handle.location()),
          RelocInfo::EMBEDDED_OBJECT);