[scala-reflect] arguments get replaced with null in MethodMirror.apply when there are both implicit and non-implicit parameters

Good morning everyone and happy MLK day!

I seem to have found a bug in scala-reflect - when invoking apply on a 
MethodMirror, I end up getting a null where I have supplied a non-null 
value.

Here is some sample code. You can see I get a null where I should get a 
B(7):

object Test extends App {
  object a {
    case class B(i: Int)
    implicit class C(val i: Int) extends AnyVal
    case class D(b: B, c: C)
  }

  import a._
  import scala.reflect.runtime.currentMirror
  import scala.reflect.runtime.universe._

  val tpe = typeOf[D]
  val classSymbol: ClassSymbol = tpe.typeSymbol.asClass
  val moduleSymbol: ModuleSymbol = classSymbol.companion.asModule
  val moduleMirror: ModuleMirror = currentMirror.reflectModule(moduleSymbol)
  val moduleInstance: Any = moduleMirror.instance
  val instanceMirror = currentMirror.reflect(moduleInstance)
  val typeSignature = instanceMirror.symbol.typeSignature
  val applyMethod = typeSignature.member(TermName("apply")).asMethod
  val applyMirror = instanceMirror.reflectMethod(applyMethod)
  val applyResult = applyMirror(B(7), new C(8))
  println(applyResult)
  // output is D(null,Test$a$C@8)
  // the null seems to be due to a fall-through at line 433 of 
JavaMirrors.scala
}

This seems to happen whenever I have a MethodMirror with both implicit and 
non-implicit parameters. I am not familiar with this code at all, but to me 
it seems like an "else args1(i) = arg" is missing just below line 433 of 
JavaMirrors.scala.

This test was run against Scala 2.11.5, but I got the same results against 
2.11.2, 2.11.3, and 2.11.4. I tried against 2.10 as well, but the API has 
changed a lot and I would have had to refactor to get it to compile there.

If you like I can submit a bug report.

Thanks! -John

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