support modern compund-assignment in js/implicit-operand-conversion

Author: erik-krogh

javascript/ql/src/Expressions/ImplicitOperandConversion.ql

@@ -130,7 +130,12 @@ class NumericConversion extends ImplicitConversion {
     or
     parent instanceof ArithmeticExpr and not parent instanceof AddExpr
     or
-    parent instanceof CompoundAssignExpr and not parent instanceof AssignAddExpr
+    parent instanceof CompoundAssignExpr and not (
+      parent instanceof AssignAddExpr or
+      parent instanceof AssignLogOrExpr or
+      parent instanceof AssignLogAndExpr or
+      parent instanceof AssignNullishCoalescingExpr
+    )
     or
     parent instanceof UpdateExpr
   }