Perform TODO(gc) cleanup for TODO-lockdown.

src/ia32/assembler-ia32-inl.h

Index: src/ia32/assembler-ia32-inl.h
diff --git a/src/ia32/assembler-ia32-inl.h b/src/ia32/assembler-ia32-inl.h
index 5ddb9f7e7a110a1da572bbf80c5c6f146a90ef0e..9878fb4e41c61eb5e9f60cef2dd7d5728b7bdb98 100644
--- a/src/ia32/assembler-ia32-inl.h
+++ b/src/ia32/assembler-ia32-inl.h
@@ -94,7 +94,8 @@ void RelocInfo::set_target_address(Address target, Code* code) {
   if (code != NULL && IsCodeTarget(rmode_)) {
     Object* target_code = Code::GetCodeFromTargetAddress(target);
 
-    // TODO(gc) We are not compacting code space.
+    // TODO(1550) We are passing NULL as a slot because code can never be on
+    // evacuation candidate.
     code->GetHeap()->incremental_marking()->RecordWrite(
         code, NULL, HeapObject::cast(target_code));
   }
@@ -159,7 +160,8 @@ void RelocInfo::set_target_cell(JSGlobalPropertyCell* cell, Code* code) {
   Memory::Address_at(pc_) = address;
   CPU::FlushICache(pc_, sizeof(Address));
   if (code != NULL) {
-    // TODO(gc) We are not compacting cell space.
+    // TODO(1550) We are passing NULL as a slot because code can never be on
+    // evacuation candidate.
     code->GetHeap()->incremental_marking()->RecordWrite(
         code, NULL, cell);
   }