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I'm confused how to create an IAM role for an ec2 machine and then use it.  The error message is super confusing.  First I create an IAM role:

```machine_role = aws.iam.Role("dockerbuilder-role", ...)```
and then I try to create an EC2 instance that uses this role:
```server = aws.ec2.Instance('dockerbuilder-pulumi',
    iam_instance_profile=machine_role,
...)```
The error message (which annoyingly takes 2 minutes to resolve annoyingly) is `InvalidParameterValue: Value (dockerbuilder-role-908245c) for parameter iamInstanceProfile.name is invalid. Invalid IAM Instance Profile name`.

Now if I instantiate the Instance with `
```iam_instance_profile="dockerbuilder-role-908245c",```
it works.  How do I get the name out of the role object to pass into the instance?

Same problem if I try
```    iam_instance_profile=machine_role.name,```

Figured it out.  Not sure why I thought it was working before - I think I was confused.  But I needed.
```machine_profile = aws.iam.InstanceProfile("dockerbuilder-profile", role=machine_role.name)

...

    iam_instance_profile=machine_profile,```