Support not boxing inline class of reference class

even if the class is other than Any.
 #KT-41429 In progress

compiler/testData/codegen/bytecodeText/coroutines/inlineClasses/noInlineClassBoxingInSuspendFunReturn_String.kt

@@ -0,0 +1,26 @@
+// IGNORE_BACKEND: JVM_IR
+
+inline class ICString(val x: String)
+
+suspend fun suspendICString(): ICString = ICString("")
+suspend fun suspendAny(): Any = ICString("")
+suspend fun <T> suspendGeneric(x: T): T = x
+
+fun useICString(x: ICString) {}
+fun useAny(x: Any) {}
+
+suspend fun test() {
+    useICString(suspendICString())
+    useICString(suspendGeneric(ICString("")))
+    useAny(suspendAny())
+    useAny(suspendICString())
+}
+
+// -- 1 in 'suspendAny(): Any = ICString("")'
+// -- 1 in 'useAny(suspendICString())'
+// -- 1 in 'suspendGeneric(ICString(""))'
+// 3 INVOKESTATIC ICString\.box-impl
+
+// -- 1 in 'useICString(suspendGeneric(ICString("")))
+// -- 1 in 'equals-impl' for ICString
+// 2 INVOKEVIRTUAL ICString\.unbox-impl

compiler/testData/codegen/bytecodeText/coroutines/inlineClasses/returnResult.kt

@@ -1,3 +1,5 @@
+// IGNORE_BACKEND: JVM_IR
+
 @Suppress("RESULT_CLASS_IN_RETURN_TYPE")
 suspend fun signInFlowStepFirst(): Result<Unit> = Result.success(Unit)
 
@@ -6,4 +8,4 @@ inline class OurAny(val a: Any)
 suspend fun returnsUnboxed(): OurAny = OurAny("OK")
 
 // 1 INVOKESTATIC kotlin/Result.box-impl
-// 0 INVOKESTATIC kotlin/OurAny.box-impl
+// 0 INVOKESTATIC OurAny.box-impl

compiler/testData/codegen/bytecodeText/coroutines/inlineClasses/returnStringOverride.kt

@@ -0,0 +1,11 @@
+inline class IC(val s: String)
+
+interface I {
+    suspend fun returnAny(): Any
+}
+
+class C : I {
+    override suspend fun returnAny(): IC = IC("OK")
+}
+
+// 1 INVOKESTATIC IC.box-impl