remove dict stable assumption for the case when the dict is copied

Author: cosminbasca

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/common/DynamicObjectStorage.java

@@ -175,7 +175,7 @@ public Assumption getDictStableAssumption() {
         @TruffleBoundary
         public HashingStorage copy(Equivalence eq) {
             assert eq == HashingStorage.DEFAULT_EQIVALENCE;
-            return new PythonObjectDictStorage(getStore().copy(getStore().getShape()), getDictStableAssumption());
+            return new PythonObjectDictStorage(getStore().copy(getStore().getShape()), null);
         }
     }
 

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/object/ObjectBuiltins.java

@@ -491,13 +491,6 @@ protected boolean isBuiltinObjectExact(PythonObject self) {
             return exactBuiltinInstanceProfile.profileIsOtherBuiltinObject(self, PythonBuiltinClassType.PythonModule);
         }
 
-        @SuppressWarnings("unused")
-        @Specialization
-        Object dict(PythonClass self, PNone none) {
-            CompilerDirectives.transferToInterpreter();
-            throw new AssertionError();
-        }
-
         @Specialization(guards = {"!isBuiltinObjectExact(self)", "!isClass(self)", "!isExactObjectInstance(self)", "isNoValue(none)"})
         Object dict(PythonObject self, @SuppressWarnings("unused") PNone none) {
             PHashingCollection dict = self.getDict();