8217381: Incovenient errors reported when annotation processor generates source file and errors in the same round

When an annotation processor reports and error, defer reporting recoverable errors from the erroneous round to the last round, to avoid reporting errors that were resolved in the erroneous round.

Reviewed-by: jjg

test/langtools/tools/javac/processing/GenerateAndErrorTest.java

@@ -0,0 +1,2 @@
+/* /nodynamiccopyright/ */
+public class GenerateAndErrorTest extends Extra implements ExtraExtra {}