Psi2Ir: Bind unbound type parameters

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/DeclarationStubGenerator.kt

@@ -120,6 +120,8 @@ class DeclarationStubGenerator(
                 generatePropertyStub(descriptor)
             is TypeAliasDescriptor ->
                 generateTypeAliasStub(descriptor)
+            is TypeParameterDescriptor ->
+                generateOrGetTypeParameterStub(descriptor)
             else ->
                 throw AssertionError("Unexpected member descriptor: $descriptor")
         }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/ExternalDependenciesGenerator.kt

@@ -65,6 +65,7 @@ private val SymbolTable.allUnbound: List<IrSymbol>
         r.addAll(unboundSimpleFunctions)
         r.addAll(unboundProperties)
         r.addAll(unboundTypeAliases)
+        r.addAll(unboundTypeParameters)
         return r
     }