Crash: Inlining private definition from companion object

[allanrenucci]

object Foo {
  private final val C = 1
}

class Foo {
  import Foo._
  inline def foo(x: Int): Boolean = x == C
}

This code snippet crashes the compiler

dotc -d out tests/allan/Foo.scala
exception occurred while compiling Foo.scala
Exception in thread "main" java.lang.AssertionError: assertion failed: unresolved symbols: method inline$C in object Foo when pickling Foo.scala
	at scala.Predef$.assert(Predef.scala:219)
	at dotty.tools.dotc.core.tasty.TreePickler.pickle(TreePickler.scala:642)
	at dotty.tools.dotc.transform.Pickler.$anonfun$run$3(Pickler.scala:56)
	at dotty.tools.dotc.transform.Pickler.$anonfun$run$3$adapted(Pickler.scala:49)
	at scala.collection.immutable.List.foreach(List.scala:389)
	at dotty.tools.dotc.transform.Pickler.$anonfun$run$2(Pickler.scala:49)
	at dotty.tools.dotc.transform.Pickler.$anonfun$run$2$adapted(Pickler.scala:48)
	at scala.collection.immutable.List.foreach(List.scala:389)
	at dotty.tools.dotc.transform.Pickler.run(Pickler.scala:48)
	at dotty.tools.dotc.core.Phases$Phase.$anonfun$runOn$1(Phases.scala:298)
	at scala.collection.immutable.List.map(List.scala:283)
	at dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:296)
	at dotty.tools.dotc.core.Phases$Phase.runOn$(Phases.scala:295)
	at dotty.tools.dotc.transform.Pickler.runOn(Pickler.scala:83)
	at dotty.tools.dotc.Run.$anonfun$compileUnits$3(Run.scala:174)
...

[allanrenucci]

Actually, this is not specific to constants. The following code snippet crashes too:

object Foo {
  private def C: String = "NotConstant"
}

class Foo {
  import Foo._
  inline def foo2 = C
}