[K/N][New MM] Support thread state switching

Including

* Support thread state switching in codegen
* Introduce and use GCUnsafeCall annotation
* Switch thread state in C++ runtime code

Also

* Register current thread in Mark&Sweep tests
* Store MemoryState in Worker instance
* Set worker tid in WorkerInit

kotlin-native/backend.native/build.gradle

@@ -194,6 +194,7 @@ targetList.each { target ->
                 '-Xmulti-platform', '-Xopt-in=kotlin.RequiresOptIn', '-Xinline-classes',
                 '-Xopt-in=kotlin.contracts.ExperimentalContracts',
                 '-Xopt-in=kotlin.ExperimentalMultiplatform',
+                '-Xopt-in=kotlin.native.internal.InternalForKotlinNative',
                 '-Xallow-result-return-type',
                 *commonSrc.toList(),
                 *testAnnotationCommon.toList(),