8073844: fatal annotation processing errors do not stop compilation

JavacProcessingEnvironment lets the should-stop policy decide when the compilation should stop.

Reviewed-by: jjg

langtools/test/tools/javac/processing/StopAfterError/StopAfterErrorAux.java

@@ -0,0 +1,6 @@
+/* /nodynamiccopyright/ */
+class StopAfterErrorAux {
+    public void test() {
+        should not; get here;
+    }
+}