Update test affected by SafeCallsAreAlwaysNullable feature

compiler/testData/codegen/box/objects/safeAccess.kt

@@ -5,4 +5,4 @@ object Test {
     val a = "OK"
 }
 
-fun box(): String = Test?.a
+fun box(): String? = Test?.a

compiler/testData/codegen/bytecodeText/nullCheckOptimization/redundantSafeCall.kt

@@ -3,4 +3,4 @@ fun test(s: String) = s?.length
 // 0 IFNULL
 // 0 IFNONNULL
 // 0 intValue
-// 0 valueOf
+// 1 valueOf

compiler/testData/codegen/bytecodeText/nullCheckOptimization/redundantSafeCall_1_4.kt

@@ -1,5 +1,4 @@
-// !API_VERSION: LATEST_STABLE
-
+// !LANGUAGE: -SafeCallsAreAlwaysNullable
 fun test(s: String) = s?.length
 
 // 0 IFNULL