(re)move Thread susbtitution for better jdk 21 compatibility

yield now has special behaviour with VirtualThreads
getState substitution doesn't seem needed since it does the same as the
bytecodes and can now be overriden

espresso/src/com.oracle.truffle.espresso/src/com/oracle/truffle/espresso/substitutions/Target_java_lang_Thread.java

@@ -180,11 +180,17 @@ private static boolean isSystemInnocuousThread(StaticObject thread, Meta meta) {
     }
 
     @TruffleBoundary
-    @Substitution(isTrivial = true)
+    @Substitution(isTrivial = true, versionFilter = VersionFilter.Java18OrEarlier.class)
     public static void yield() {
         Thread.yield();
     }
 
+    @TruffleBoundary
+    @Substitution(isTrivial = true)
+    public static void yield0() {
+        Thread.yield();
+    }
+
     @SuppressWarnings("unused")
     @Substitution(hasReceiver = true)
     @TruffleBoundary // Host Thread.setPriority inlines too deeply.
@@ -204,19 +210,6 @@ public static boolean isAlive(@JavaType(Thread.class) StaticObject self,
         return context.getThreadAccess().isAlive(self);
     }
 
-    @Substitution(hasReceiver = true)
-    abstract static class GetState extends SubstitutionNode {
-        abstract @JavaType(internalName = "Ljava/lang/Thread$State;") StaticObject execute(@JavaType(Thread.class) StaticObject self);
-
-        @Specialization
-        @JavaType(internalName = "Ljava/lang/Thread$State;")
-        StaticObject doDefault(@JavaType(Thread.class) StaticObject self,
-                        @Bind("getContext()") EspressoContext context,
-                        @Cached("create(context.getMeta().sun_misc_VM_toThreadState.getCallTarget())") DirectCallNode toThreadState) {
-            return (StaticObject) toThreadState.call(context.getThreadAccess().getState(self));
-        }
-    }
-
     @SuppressWarnings("unused")
     @Substitution
     public static void registerNatives() {