[K2/N] Rework testStdlibFramework to avoid compiler crash due to KT-58459

^KT-58459

Merge-request: KT-MR-10043
Merged-by: Vladimir Sukharev <Vladimir.Sukharev@jetbrains.com>

kotlin-native/backend.native/tests/build.gradle

@@ -5867,7 +5867,6 @@ if (isAppleTarget(project)) {
         swiftSources = ['framework/values_generics/']
     }
 
-    if(!isK2(project))  // KT-56271
     frameworkTest("testStdlibFramework") {
         framework('Stdlib') {
             sources = ['framework/stdlib']

kotlin-native/backend.native/tests/framework/stdlib/stdlib.kt

@@ -72,7 +72,6 @@ fun gc() = kotlin.native.runtime.GC.collect()
 @Throws(Throwable::class)
 @Suppress("INVISIBLE_REFERENCE", "INVISIBLE_MEMBER")
 fun testSet(set: Set<String>) {
-    set as kotlin.native.internal.KonanSet<String> // Smart cast to access getElement below.
     val setAny: Set<Any?> = set
 
     assertTrue(set.contains("a"))
@@ -80,7 +79,7 @@ fun testSet(set: Set<String>) {
     assertFalse(set.contains("h"))
     assertFalse(setAny.contains(1))
 
-
+    set as kotlin.native.internal.KonanSet<String> // Smart cast to access getElement below.
     assertEquals("a", set.getElement("a"))
     assertNull(set.getElement("aa"))
     assertNull((setAny as kotlin.native.internal.KonanSet<Any?>).getElement(1))