Support passing inline class values with spread operator

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

@@ -0,0 +1,20 @@
+// !LANGUAGE: +InlineClasses
+
+inline class UInt(val u: Int)
+
+fun <T> takeVarargs(vararg e: T) {}
+
+fun test(u1: UInt, u2: UInt, us: Array<UInt>) {
+    takeVarargs(*us) // copy + checkcast
+    takeVarargs(u1, u2, *us) // 2 box + ...
+}
+
+// 2 INVOKESTATIC UInt\$Erased.box
+// 0 INVOKEVIRTUAL UInt.unbox
+
+// 2 CHECKCAST \[LUInt
+
+// 0 CHECKCAST \[Ljava/lang/Integer
+
+// 0 intValue
+// 0 valueOf