Make lazy vals run on non-fallback graal image - remove dynamic reflection (#16346)

Fix #13985
I tested it and it seems to fix the issue

Author: szymon-rd

library/src/scala/runtime/LazyVals.scala

@@ -9,19 +9,21 @@ import scala.annotation.*
  */
 object LazyVals {
   @nowarn
-  private[this] val unsafe: sun.misc.Unsafe =
-      classOf[sun.misc.Unsafe].getDeclaredFields.nn.find { field =>
-        field.nn.getType == classOf[sun.misc.Unsafe] && {
-          field.nn.setAccessible(true)
-          true
-        }
-      }
-      .map(_.nn.get(null).asInstanceOf[sun.misc.Unsafe])
-      .getOrElse {
-        throw new ExceptionInInitializerError {
-          new IllegalStateException("Can't find instance of sun.misc.Unsafe")
-        }
-      }
+  private[this] val unsafe: sun.misc.Unsafe = {
+    def throwInitializationException() = 
+      throw new ExceptionInInitializerError(
+        new IllegalStateException("Can't find instance of sun.misc.Unsafe")
+      )
+    try
+      val unsafeField = classOf[sun.misc.Unsafe].getDeclaredField("theUnsafe").nn
+      if unsafeField.getType == classOf[sun.misc.Unsafe] then
+        unsafeField.setAccessible(true)
+        unsafeField.get(null).asInstanceOf[sun.misc.Unsafe]
+      else
+        throwInitializationException()
+    catch case _: NoSuchFieldException =>
+      throwInitializationException()
+  }
 
   private[this] val base: Int = {
     val processors = java.lang.Runtime.getRuntime.nn.availableProcessors()