Use weak cell to embed known map in CompareIC

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index 1c74450c6cb62740dff6bcb952b9c7fe6db923bf..77269429821307466e85c9c87554e810808700ee 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -3776,15 +3776,17 @@ void CompareICStub::GenerateObjects(MacroAssembler* masm) {
 
 void CompareICStub::GenerateKnownObjects(MacroAssembler* masm) {
   Label miss;
+  Handle<WeakCell> cell = Map::WeakCellForMap(known_map_);
   __ mov(ecx, edx);
   __ and_(ecx, eax);
   __ JumpIfSmi(ecx, &miss, Label::kNear);
 
+  __ GetWeakValue(edi, cell);
   __ mov(ecx, FieldOperand(eax, HeapObject::kMapOffset));
   __ mov(ebx, FieldOperand(edx, HeapObject::kMapOffset));
-  __ cmp(ecx, known_map_);
+  __ cmp(ecx, edi);
   __ j(not_equal, &miss, Label::kNear);
-  __ cmp(ebx, known_map_);
+  __ cmp(ebx, edi);
   __ j(not_equal, &miss, Label::kNear);
 
   __ sub(eax, edx);