Unmute some JVM_IR inlining tests

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

@@ -1,6 +1,4 @@
 // !LANGUAGE: +InlineClasses
-// IGNORE_BACKEND: JVM_IR
-// This test fails on JVM_IR because of a missing implicit cast from UInt? to UInt.
 
 inline class UInt(private val value: Int) {
     operator fun plus(other: UInt): UInt = UInt(value + other.asValue())

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

@@ -1,5 +1,4 @@
 // !LANGUAGE: +InlineClasses
-// IGNORE_BACKEND: JVM_IR
 
 inline class Result<T>(val a: Any?) {
     fun getOrThrow(): T = a as T

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

@@ -1,5 +1,4 @@
 // !LANGUAGE: +InlineClasses
-// IGNORE_BACKEND: JVM_IR
 // WITH_RUNTIME
 // TARGET_BACKEND: JVM