RFR: [Backport] JDK14-8235778: No compilation error reported when a record is declared in a local class

[Vicente Romero]

Please review backport of bug [1] into JDK14. The fix was initially 
pushed to JDK15. The fix for JDK14 can be seen at [2]. The initial 
review thread for the fix that got pushed into JDK15 can be seen at [3].

Thanks,
Vicente

[1] https://bugs.openjdk.java.net/browse/JDK-8235778
[2] http://cr.openjdk.java.net/~vromero/8235778_jdk14/webrev.00/
[3] 
https://mail.openjdk.java.net/pipermail/compiler-dev/2019-December/014076.html