JVM_IR: box inline class values returned by suspend inline lambdas

The call site inside the inline function expects them to return a boxed
value, like FunctionN.invoke would.

 #KT-46915 Fixed

compiler/testData/codegen/boxInline/suspend/inlineClass/returnBoxedFromLambda.kt

@@ -0,0 +1,20 @@
+// WITH_RUNTIME
+// WITH_COROUTINES
+// IGNORE_BACKEND: JS_IR
+// FILE: 1.kt
+inline fun <T, R> (suspend () -> T).map(crossinline transform: suspend (T) -> R): suspend () -> R =
+    { transform(this()) }
+
+// FILE: 2.kt
+import helpers.*
+import kotlin.coroutines.*
+
+inline class C(val value: Int)
+
+fun box(): String {
+    var result = 0
+    suspend {
+        result = suspend { C(1) as C? }.map { it }()?.value ?: 2
+    }.startCoroutine(EmptyContinuation)
+    return if (result == 1) "OK" else "fail: $result"
+}

compiler/testData/codegen/boxInline/suspend/inlineClass/returnUnboxedFromLambda.kt

@@ -0,0 +1,20 @@
+// WITH_RUNTIME
+// WITH_COROUTINES
+// IGNORE_BACKEND: JS_IR
+// FILE: 1.kt
+inline fun <T, R> (suspend () -> T).map(crossinline transform: suspend (T) -> R): suspend () -> R =
+    { transform(this()) }
+
+// FILE: 2.kt
+import helpers.*
+import kotlin.coroutines.*
+
+inline class C(val value: String)
+
+fun box(): String {
+    var result = "fail"
+    suspend {
+        result = suspend { C("OK") }.map { it }().value
+    }.startCoroutine(EmptyContinuation)
+    return result
+}