RFR (backport 11u): JDK-8244763: Update --release 8 symbol information after JSR 337 MR3

[Jan Lahoda]

Hi,

I'd like to ask for a review of a backport of:
https://bugs.openjdk.java.net/browse/JDK-8244763
https://hg.openjdk.java.net/jdk/jdk15/rev/d0b86d63c00f

The patch unfortunately does not apply cleanly, so manual fixes were 
needed, but the backport patch should be conceptually the same as the 
original one.

Proposed backport webrev:
http://cr.openjdk.java.net/~jlahoda/8244763/webrev.backport.00/

Original review thread:
https://mail.openjdk.java.net/pipermail/compiler-dev/2020-May/014537.html

Does this look reasonable?

Thanks,
     Jan