Support varargs of inline class types with non-trivial spread

#KT-24880 In Progress

compiler/testData/codegen/bytecodeText/inlineClasses/noBoxingOperationsOnNonTrivialSpread.kt

@@ -0,0 +1,27 @@
+// !LANGUAGE: +InlineClasses
+// !WITH_UNSIGNED
+// !SKIP_METADATA_VERSION_CHECK
+
+fun uint(vararg us: UInt): UIntArray = us
+
+// FILE: NoBoxing.kt
+
+fun test1(us: UIntArray) {
+    uint(1u, *us, 2u, *us)
+}
+
+// @NoBoxingKt.class:
+// 0 INVOKESTATIC kotlin.UInt\$Erased.box
+// 0 INVOKEVIRTUAL kotlin.UInt.unbox
+
+// FILE: Boxing.kt
+
+fun nullableUInt(vararg us: UInt?) {}
+
+fun test2(nullable: UInt?, ns: Array<UInt>) {
+    nullableUInt(1u, nullable, 3u, *ns)
+}
+
+// @BoxingKt.class:
+// 2 INVOKESTATIC kotlin.UInt\$Erased.box
+// 0 INVOKEVIRTUAL kotlin.UInt.unbox