[K/N] Migrate most simple filecheck tests to new infra

^KT-62157


Merge-request: KT-MR-12376
Merged-by: Vladimir Sukharev <Vladimir.Sukharev@jetbrains.com>

compiler/testData/codegen/box/fileCheck/escape_analysis.kt

@@ -0,0 +1,14 @@
+// TARGET_BACKEND: NATIVE
+// FILECHECK_STAGE: CStubs
+
+class A(val x: Int)
+
+// CHECK-LABEL: define %struct.ObjHeader* @"kfun:#box(){}kotlin.String"
+fun box(): String {
+    // CHECK-DEBUG: call %struct.ObjHeader* @AllocInstance
+    // CHECK-OPT: alloca %"kclassbody:A#internal"
+    val a = A(5)
+    println(a.x)
+// CHECK-LABEL: epilogue:
+    return "OK"
+}