[K/N][New MM] Move ThreadStateGuard to the main Memory.h

Integrating the stdlib with the thread states machinery requires
accessing to some parts of the new MM. This patch provides this
access by moving these parts to the main Memory.h header.

kotlin-native/runtime/src/mm/cpp/Memory.cpp

@@ -427,3 +427,15 @@ extern "C" RUNTIME_NOTHROW void Kotlin_mm_safePointExceptionUnwind() {
     auto* threadData = mm::ThreadRegistry::Instance().CurrentThreadData();
     threadData->gc().SafePointExceptionUnwind();
 }
+
+extern "C" ALWAYS_INLINE RUNTIME_NOTHROW void Kotlin_mm_switchThreadStateNative() {
+    SwitchThreadState(mm::ThreadRegistry::Instance().CurrentThreadData(), ThreadState::kNative);
+}
+
+extern "C" ALWAYS_INLINE RUNTIME_NOTHROW void Kotlin_mm_switchThreadStateRunnable() {
+    SwitchThreadState(mm::ThreadRegistry::Instance().CurrentThreadData(), ThreadState::kRunnable);
+}
+
+MemoryState* kotlin::mm::GetMemoryState() {
+    return ToMemoryState(ThreadRegistry::Instance().CurrentThreadDataNode());
+}