Made vararg parameters have Array<out T> type

instead of simply Array<T>
  #KT-1638 Fixed
  #KT-2163 Fixed
  #KT-3213 Fixed
  #KT-4172 Fixed
  #KT-5534 Fixed

compiler/testData/diagnostics/testsWithStdLib/varargs/kt3213.kt

@@ -0,0 +1,7 @@
+// !CHECK_TYPE
+
+fun test(a: Array<out String>) {
+    val b = a.toList()
+
+    b checkType { it : _<List<String>> }
+}

compiler/testData/diagnostics/testsWithStdLib/varargs/kt3213.txt

@@ -0,0 +1,3 @@
+package
+
+internal fun test(/*0*/ a: kotlin.Array<out kotlin.String>): kotlin.Unit

compiler/testData/diagnostics/testsWithStdLib/varargs/kt4172j.kt

@@ -0,0 +1,9 @@
+// FILE: A.java
+public class A {
+    public static void main(String[] args) {}
+}
+
+// FILE: 1.kt
+fun main(args: Array<String>) {
+    A.main(array())
+}

compiler/testData/diagnostics/testsWithStdLib/varargs/kt4172j.txt

@@ -0,0 +1,13 @@
+package
+
+internal fun main(/*0*/ args: kotlin.Array<kotlin.String>): kotlin.Unit
+
+public open class A {
+    public constructor A()
+    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
+
+    // Static members
+    public open fun main(/*0*/ args: kotlin.Array<(out) kotlin.String!>!): kotlin.Unit
+}

compiler/testData/diagnostics/testsWithStdLib/varargs/kt5534.kt

@@ -0,0 +1,6 @@
+fun test() {
+    val p: Array<String> = array("a")
+    foo(*p)
+}
+
+fun foo(vararg a: String?) = a

compiler/testData/diagnostics/testsWithStdLib/varargs/kt5534.txt

@@ -0,0 +1,4 @@
+package
+
+internal fun foo(/*0*/ vararg a: kotlin.String? /*kotlin.Array<out kotlin.String?>*/): kotlin.Array<out kotlin.String?>
+internal fun test(): kotlin.Unit