Allow impl class to be data class, allow impl constructor properties

compiler/testData/diagnostics/tests/multiplatform/headerClass/implDataClass.kt

@@ -0,0 +1,32 @@
+// !LANGUAGE: +MultiPlatformProjects
+// MODULE: m1-common
+// FILE: common.kt
+
+header class Foo(x: Int, y: String) {
+    val x: Int
+    val y: String
+}
+
+header class Bar(z: Double)
+
+header class Baz(w: List<String>) {
+    val w: List<String>
+
+    operator fun component1(): List<String>
+
+    // Disabled because default arguments are not allowed
+    // fun copy(w: List<T> = ...): Baz<T>
+
+    override fun equals(other: Any?): Boolean
+    override fun hashCode(): Int
+    override fun toString(): String
+}
+
+// MODULE: m2-jvm(m1-common)
+// FILE: jvm.kt
+
+impl data class Foo(impl val x: Int, impl val y: String)
+
+impl data class Bar(val z: Double)
+
+impl data class Baz(impl val w: List<String>)

compiler/testData/diagnostics/tests/multiplatform/headerClass/implDataClass.txt

@@ -0,0 +1,63 @@
+// -- Module: <m1-common> --
+package
+
+public final header class Bar {
+    public constructor Bar(/*0*/ z: kotlin.Double)
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final header class Baz {
+    public constructor Baz(/*0*/ w: kotlin.collections.List<kotlin.String>)
+    public final val w: kotlin.collections.List<kotlin.String>
+    public final operator header fun component1(): kotlin.collections.List<kotlin.String>
+    public open header override /*1*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open header override /*1*/ fun hashCode(): kotlin.Int
+    public open header override /*1*/ fun toString(): kotlin.String
+}
+
+public final header class Foo {
+    public constructor Foo(/*0*/ x: kotlin.Int, /*1*/ y: kotlin.String)
+    public final val x: kotlin.Int
+    public final val y: kotlin.String
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+
+// -- Module: <m2-jvm> --
+package
+
+public final impl data class Bar {
+    public constructor Bar(/*0*/ z: kotlin.Double)
+    public final val z: kotlin.Double
+    public final operator /*synthesized*/ fun component1(): kotlin.Double
+    public final /*synthesized*/ fun copy(/*0*/ z: kotlin.Double = ...): Bar
+    public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}
+
+public final impl data class Baz {
+    public constructor Baz(/*0*/ w: kotlin.collections.List<kotlin.String>)
+    public final val w: kotlin.collections.List<kotlin.String>
+    public final operator /*synthesized*/ fun component1(): kotlin.collections.List<kotlin.String>
+    public final /*synthesized*/ fun copy(/*0*/ w: kotlin.collections.List<kotlin.String> = ...): Baz
+    public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}
+
+public final impl data class Foo {
+    public constructor Foo(/*0*/ x: kotlin.Int, /*1*/ y: kotlin.String)
+    public final val x: kotlin.Int
+    public final val y: kotlin.String
+    public final operator /*synthesized*/ fun component1(): kotlin.Int
+    public final operator /*synthesized*/ fun component2(): kotlin.String
+    public final /*synthesized*/ fun copy(/*0*/ x: kotlin.Int = ..., /*1*/ y: kotlin.String = ...): Foo
+    public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}