[cleanup] Drop handwritten KeyedStoreIC code

src/ic/stub-cache.h

Index: src/ic/stub-cache.h
diff --git a/src/ic/stub-cache.h b/src/ic/stub-cache.h
index bdd7f4a3bef08ca1521083d6141a772a3bbd5b28..e8df26d37b3b6142297bf228315534c0bc8e97a9 100644
--- a/src/ic/stub-cache.h
+++ b/src/ic/stub-cache.h
@@ -48,13 +48,6 @@ class StubCache {
   // Collect all maps that match the name.
   void CollectMatchingMaps(SmallMapList* types, Handle<Name> name,
                            Handle<Context> native_context, Zone* zone);
-  // Generate code for probing the stub cache table.
-  // Arguments extra, extra2 and extra3 may be used to pass additional scratch
-  // registers. Set to no_reg if not needed.
-  // If leave_frame is true, then exit a frame before the tail call.
-  void GenerateProbe(MacroAssembler* masm, Register receiver, Register name,
-                     Register scratch, Register extra, Register extra2 = no_reg,
-                     Register extra3 = no_reg);
 
   enum Table { kPrimary, kSecondary };