anchor.diff:  
     HType computeTypeFromInputTypes(HInvokeDynamic instruction,
                                     Compiler compiler) {
  -    return instruction.instructionType;
  +    return HType.UNKNOWN;
     }
   
     HInstruction tryConvertToBuiltin(HInvokeDynamic instruction,
  
positive.code:     if (instruction.inputs[1].instructionType.isPrimitiveOrNull()) {
        return HType.BOOLEAN;
      }
      return instruction.instructionType;
    }
  
    HType computeDesiredTypeForInput(HInvokeDynamic instruction,
  
negative.code:                                   Compiler compiler) {
      HInstruction left = instruction.inputs[1];
      if (left.isNumber()) return HType.DOUBLE;
      return HType.UNKNOWN;
    }
  
    HType computeDesiredTypeForInput(HInstruction instruction,
  