[K/N][Tests] Migrate some cinterop tests to new infra

^KT-61259

compiler/testData/codegen/box/cinterop/basics/values.kt

@@ -0,0 +1,30 @@
+// TARGET_BACKEND: NATIVE
+// MODULE: cinterop
+// FILE: cvalues.def
+---
+_Bool isNullString(const char* str) {
+    return str == (const char*)0;
+}
+
+typedef const short* LPCWSTR;
+
+_Bool isNullWString(LPCWSTR str) {
+    return str == (LPCWSTR)0;
+}
+
+// MODULE: main(cinterop)
+// FILE: main.kt
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+
+import kotlinx.cinterop.*
+import kotlin.test.*
+import cvalues.*
+
+fun box(): String {
+    assertTrue(isNullString(null))
+    assertTrue(isNullWString(null))
+    assertFalse(isNullString("a"))
+    assertFalse(isNullWString("b"))
+
+    return "OK"
+}