Use Implied instead of Implicit for implicit matches

`Implicit` will be changed to mean "old-style implicits".

Author: odersky

compiler/src/dotty/tools/dotc/typer/Typer.scala

@@ -1442,7 +1442,7 @@ class Typer extends Namer
             if (body1.tpe.isInstanceOf[TermRef]) pt1
             else body1.tpe.underlyingIfRepeated(isJava = false)
           val sym = ctx.newPatternBoundSymbol(tree.name, symTp, tree.span)
-          if (pt == defn.ImplicitScrutineeTypeRef) sym.setFlag(Implicit)
+          if (pt == defn.ImplicitScrutineeTypeRef) sym.setFlag(Implied)
           if (ctx.mode.is(Mode.InPatternAlternative))
             ctx.error(i"Illegal variable ${sym.name} in pattern alternative", tree.sourcePos)
           assignType(cpy.Bind(tree)(tree.name, body1), sym)