IssueTracker

Component used: Room
Version used: 1.1.0-alpha1
Devices/Android versions reproduced on: Compiled with API 27

This worked with Room 1.0.0, but now fails probably because it doesn't look past the first constructor when searching for one to use.

```
data class MyComplexClass @JvmOverloads constructor(
        @field:Relation(parentColumn = "uid", entityColumn = "uid", entity = OtherThing::class)
        var otherThings: Set<OtherThing> = setOf(),
        @field:Embedded
        val mainThing: MainThing)
```

Now it fails the build with `Error:(70, 2) error: Fields annotated with @Relation cannot be constructor parameters. These values are fetched after the object is constructed.` even though there is a valid constructor that only accepts a `MainThing` object and a valid setter that sets the `@Relation` field.