Use weak cell to embed known map in CompareIC

src/x87/code-stubs-x87.cc

Index: src/x87/code-stubs-x87.cc
diff --git a/src/x87/code-stubs-x87.cc b/src/x87/code-stubs-x87.cc
index 94fc888d7449339dd5908d6538d2324381de002a..c11ca607257e2c921790a5cd39f6607b6d3a7e26 100644
--- a/src/x87/code-stubs-x87.cc
+++ b/src/x87/code-stubs-x87.cc
@@ -3437,15 +3437,17 @@ 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);