Load setter from map descriptor instead of embedding it in handler.

src/ic/arm/handler-compiler-arm.cc

Index: src/ic/arm/handler-compiler-arm.cc
diff --git a/src/ic/arm/handler-compiler-arm.cc b/src/ic/arm/handler-compiler-arm.cc
index c4f95a4e5d197c340aaf2caad3bd947f523ebf99..88189aa31e65ad36a9a5a0d769f806ac75ce5e76 100644
--- a/src/ic/arm/handler-compiler-arm.cc
+++ b/src/ic/arm/handler-compiler-arm.cc
@@ -59,7 +59,7 @@ void NamedLoadHandlerCompiler::GenerateLoadViaGetter(
 
 void NamedStoreHandlerCompiler::GenerateStoreViaSetter(
     MacroAssembler* masm, Handle<HeapType> type, Register receiver,
-    Handle<JSFunction> setter) {
+    Register holder, int accessor_index, int expected_arguments) {
   // ----------- S t a t e -------------
   //  -- lr    : return address
   // -----------------------------------
@@ -69,7 +69,7 @@ void NamedStoreHandlerCompiler::GenerateStoreViaSetter(
     // Save value register, so we can restore it later.
     __ push(value());
 
-    if (!setter.is_null()) {
+    if (accessor_index >= 0) {
       // Call the JavaScript setter with receiver and value on the stack.
       if (IC::TypeToMap(*type, masm->isolate())->IsJSGlobalObjectMap()) {
         // Swap in the global receiver.
@@ -78,9 +78,14 @@ void NamedStoreHandlerCompiler::GenerateStoreViaSetter(
       }
       __ Push(receiver, value());
       ParameterCount actual(1);
-      ParameterCount expected(setter);
-      __ InvokeFunction(setter, expected, actual, CALL_FUNCTION,
-                        NullCallWrapper());
+      ParameterCount expected(expected_arguments);
+      Register scratch = holder;
+      __ ldr(scratch, FieldMemOperand(holder, HeapObject::kMapOffset));
+      __ LoadInstanceDescriptors(scratch, scratch);
+      __ ldr(scratch, FieldMemOperand(scratch, DescriptorArray::GetValueOffset(
+                                                   accessor_index)));
+      __ ldr(r1, FieldMemOperand(scratch, AccessorPair::kSetterOffset));
+      __ InvokeFunction(r1, expected, actual, CALL_FUNCTION, NullCallWrapper());
     } else {
       // If we generate a global code snippet for deoptimization only, remember
       // the place to continue after deoptimization.