[K/N][tests] Do not run backed.native tests with aggressive GC

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

@@ -110,13 +110,6 @@ tasks.withType(RunExternalTestGroup.class).configureEach {
 ext.isExperimentalMM = project.globalTestArgs.contains("-memory-model") && project.globalTestArgs.contains("experimental")
 ext.isNoopGC = project.globalTestArgs.contains("-Xgc=noop")
 
-if (ext.isExperimentalMM) {
-    // TODO: Make it more aggressive and only turn it on for a subset of tests.
-    tasks.withType(KonanCompileNativeBinary.class).configureEach {
-        extraOpts "-Xbinary=gcSchedulerType=aggressive"
-    }
-}
-
 // TODO: It also makes sense to test -g without asserts, and also to test -opt with asserts.
 if (project.globalTestArgs.contains("-g")) {
     tasks.withType(KonanCompileNativeBinary.class).configureEach {

kotlin-native/backend.native/tests/runtime/collections/hash_map1.kt

@@ -89,11 +89,6 @@ fun testClear() {
 }
 
 @Test fun runTest() {
-    // TODO: Do not manually control this.
-    if (Platform.memoryModel == MemoryModel.EXPERIMENTAL) {
-        GC.threshold = 1000000
-        GC.thresholdAllocations = 1000000
-    }
     testRehashAndCompact()
     testClear()
     println("OK")

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

@@ -58,9 +58,8 @@ fun test() {
     val progressReportsCount = 100
 
     if (Platform.memoryModel == MemoryModel.EXPERIMENTAL) {
-        kotlin.native.internal.GC.thresholdAllocations = retainLimit
-        // Effectively disable trigger on safepoints.
-        kotlin.native.internal.GC.threshold = Int.MAX_VALUE
+        kotlin.native.internal.GC.autotune = false
+        kotlin.native.internal.GC.targetHeapBytes = retainLimit
     }
 
     // On Linux, the child process might immediately commit the same amount of memory as the parent.