Use weak cell in monomorphic KeyedStore IC.

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index 2c798c1749f70cd152c2afddabf09e936e8a5f5a..0aa886bac724a3236d86382c0f7f04558c355f1d 100644
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -2252,18 +2252,16 @@ void MacroAssembler::CheckMap(Register obj,
 }
 
 
-void MacroAssembler::DispatchMap(Register obj,
-                                 Register scratch,
-                                 Handle<Map> map,
-                                 Handle<Code> success,
-                                 SmiCheckType smi_check_type) {
+void MacroAssembler::DispatchWeakMap(Register obj, Register scratch1,
+                                     Register scratch2, Handle<WeakCell> cell,
+                                     Handle<Code> success,
+                                     SmiCheckType smi_check_type) {
   Label fail;
   if (smi_check_type == DO_SMI_CHECK) {
     JumpIfSmi(obj, &fail);
   }
-  ldr(scratch, FieldMemOperand(obj, HeapObject::kMapOffset));
-  mov(ip, Operand(map));
-  cmp(scratch, ip);
+  ldr(scratch1, FieldMemOperand(obj, HeapObject::kMapOffset));
+  CmpWeakValue(scratch1, cell, scratch2);
   Jump(success, RelocInfo::CODE_TARGET, eq);
   bind(&fail);
 }