Don't reference ThreadDeath directly due to its future removal

Author: pivovarit

vavr/src/main/java/io/vavr/control/Try.java

@@ -1696,7 +1696,7 @@ interface TryModule {
     static boolean isFatal(Throwable throwable) {
         return throwable instanceof InterruptedException
                 || throwable instanceof LinkageError
-                || throwable instanceof ThreadDeath
+                || ThreadDeathResolver.isThreadDeath(throwable)
                 || throwable instanceof VirtualMachineError;
     }
 
@@ -1707,3 +1707,19 @@ static <T extends Throwable, R> R sneakyThrow(Throwable t) throws T {
     }
 
 }
+
+static class ThreadDeathResolver {
+    static final Class<?> THREAD_DEATH_CLASS = resolve();
+
+    static boolean isThreadDeath(Throwable throwable) {
+        return THREAD_DEATH_CLASS != null && THREAD_DEATH_CLASS.isInstance(throwable);
+    }
+
+    private static Class<?> resolve() {
+        try {
+            return Class.forName("java.lang.ThreadDeath");
+        } catch (ClassNotFoundException e) {
+            return null;
+        }
+    }
+}