Fix generation of elvis with null constant for inline classes

compiler/testData/codegen/box/inlineClasses/elvisWithInlineClassAndNullConstant.kt

@@ -0,0 +1,16 @@
+// !LANGUAGE: +InlineClasses
+
+inline class UInt(private val data: Int) {
+    fun result(): String = if (data == 1) "OK" else "fail"
+}
+
+fun f(): UInt {
+    val unull = UInt(1) ?: null
+    return nonNull(unull)
+}
+
+fun nonNull(u: UInt?) = u!!
+
+fun box(): String {
+    return f().result()
+}

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

@@ -0,0 +1,13 @@
+// !LANGUAGE: +InlineClasses
+
+inline class UInt(private val data: Int)
+
+fun f() {
+    val unull = UInt(1) ?: null
+}
+
+// 1 INVOKESTATIC UInt\$Erased.box
+// 0 INVOKEVIRTUAL UInt.unbox
+
+// 0 valueOf
+// 0 intValue