Move JVM-specific annotations out of built-ins

Move 'volatile' and 'synchronized' to package 'kotlin' in stdlib. Also delete
'atomic', since its support was never implemented

compiler/testData/codegen/box/fieldRename/delegates.kt

@@ -1,5 +1,5 @@
 public open class TestDelegate<T: Any>(private val initializer: () -> T) {
-    private volatile var value: T? = null
+    private var value: T? = null
 
     public open fun get(thisRef: Any?, desc: PropertyMetadata): T {
         if (value == null) {

compiler/testData/codegen/bytecodeText/noVolatileAnnotation.kt

@@ -1,3 +1,3 @@
 volatile val foo: Int = 1
 
-// 0 jet/volatile
+// 0 kotlin/volatile