Disable running checkers by default (#4644)

* Make checkers be disabled by default

* Allow running checkers in test launcher

kotlin-native/backend.native/tests/runtime/memory/cycle_collector.kt

@@ -1,5 +1,6 @@
 import kotlin.native.concurrent.*
 import kotlin.native.internal.GC
+import kotlin.native.Platform
 import kotlin.test.*
 
 fun test1() {
@@ -175,6 +176,7 @@ fun test9() {
 }
 
 fun main() {
+    Platform.isMemoryLeakCheckerActive = true
     kotlin.native.internal.GC.cyclicCollectorEnabled = true
     test1()
     test2()
@@ -187,4 +189,4 @@ fun main() {
     test7()
     test8()
     test9()
-}
+}

kotlin-native/backend.native/tests/runtime/memory/cycle_detector.kt

@@ -1,5 +1,6 @@
 import kotlin.native.concurrent.*
 import kotlin.native.internal.GC
+import kotlin.native.Platform
 import kotlin.test.*
 
 class Holder(var other: Any?)
@@ -32,6 +33,11 @@ fun assertArrayEquals(
     }
 }
 
+@BeforeTest
+fun enableMemoryChecker() {
+    Platform.isMemoryLeakCheckerActive = true
+}
+
 @Test
 fun noCycles() {
     val atomic1 = AtomicReference<Any?>(null)

kotlin-native/backend.native/tests/runtime/memory/leak_memory.kt

@@ -1,5 +1,7 @@
 import kotlinx.cinterop.*
+import kotlin.native.Platform
 
 fun main() {
+    Platform.isMemoryLeakCheckerActive = true
     StableRef.create(Any())
 }

kotlin-native/backend.native/tests/runtime/memory/leak_memory_test_runner.kt

@@ -0,0 +1,14 @@
+import kotlin.test.*
+
+import kotlinx.cinterop.*
+import kotlin.native.Platform
+
+@BeforeTest
+fun enableMemoryChecker() {
+    Platform.isMemoryLeakCheckerActive = true
+}
+
+@Test
+fun test() {
+    StableRef.create(Any())
+}