Associate vararg of unsigned types with corresponding arrays

This is a first step, full support will be added later

 #KT-24880 In Progress

compiler/testData/codegen/box/unsignedTypes/varargsOfUnsignedTypes.kt

@@ -0,0 +1,34 @@
+// !LANGUAGE: +InlineClasses
+// !SKIP_METADATA_VERSION_CHECK
+// WITH_UNSIGNED
+
+fun uint(vararg us: UInt): UIntArray = us
+
+fun nullableUInt(vararg us: UInt?): UIntArray {
+    val ls = us.filterNotNull()
+    return UIntArray(ls.size) { ls[it] }
+}
+
+inline fun inlinedUInt(vararg us: UInt): UIntArray = us
+
+fun box(): String {
+    val uints = uint(1u, 2u, 3u)
+    if (sum(*uints) != 6u) return "Fail 1"
+
+    val nullableUInts = nullableUInt(1u, null, 2u, null)
+    if (sum(*nullableUInts) != 3u) return "Fail 2"
+
+    val inlinedUInts = inlinedUInt(1u, 3u)
+    if (sum(*inlinedUInts) != 4u) return "Fail 3"
+
+    return "OK"
+}
+
+fun sum(vararg us: UInt): UInt {
+    var sum = 0u
+    for (i in us) {
+        sum += i
+    }
+
+    return sum
+}