[stubs] Reduce number of StoreTransitionStub instances.

src/interface-descriptors.h

Index: src/interface-descriptors.h
diff --git a/src/interface-descriptors.h b/src/interface-descriptors.h
index 76530fcf3889d27ccd2187ba5a21f0478a8a62b6..09dc377338632ad6a7c67cb01955d6a3504b505f 100644
--- a/src/interface-descriptors.h
+++ b/src/interface-descriptors.h
@@ -24,6 +24,7 @@ class PlatformInterfaceDescriptor;
   V(LoadGlobalWithVector)                 \
   V(Store)                                \
   V(StoreWithVector)                      \
+  V(StoreNamedTransition)                 \
   V(StoreTransition)                      \
   V(VarArgFunction)                       \
   V(FastNewClosure)                       \
@@ -349,6 +350,24 @@ class StoreTransitionDescriptor : public StoreDescriptor {
   static const int kStackArgumentsCount = kPassLastArgsOnStack ? 3 : 0;
 };
 
+class StoreNamedTransitionDescriptor : public StoreTransitionDescriptor {
+ public:
+  DEFINE_PARAMETERS(kReceiver, kFieldOffset, kMap, kValue, kSlot, kVector,
+                    kName)
+  DECLARE_DESCRIPTOR_WITH_CUSTOM_FUNCTION_TYPE(StoreNamedTransitionDescriptor,
+                                               StoreTransitionDescriptor)
+
+  // Always pass name on the stack.
+  static const bool kPassLastArgsOnStack = true;
+  static const int kStackArgumentsCount =
+      StoreTransitionDescriptor::kStackArgumentsCount + 1;
+
+  static const Register NameRegister() { return no_reg; }
+  static const Register FieldOffsetRegister() {
+    return StoreTransitionDescriptor::NameRegister();
+  }
+};
+
 class StoreWithVectorDescriptor : public StoreDescriptor {
  public:
   DEFINE_PARAMETERS(kReceiver, kName, kValue, kSlot, kVector)